Sensible New Yorkers didn’t need yet another reason to vote against Zohran Mamdani for mayor, but Monday’s horrific Midtown slaughter provided a clear illustration of why the radical Democrat must not win the keys to City Hall.

Mamdani is in Uganda celebrating his wedding, but his initial statement on X about the bloodbath on Park Avenue rings hollow given his past smears of the NYPD and repeated calls to ­“defund the police.”

“I’m heartbroken to learn of the horrific shooting in midtown and I am holding the victims, their families, and the NYPD officer in critical condition in my thoughts,” Mamdani posted on X late Monday.

“Grateful for all of our first responders on the ground.”

By the time of that statement, Mayor Adams and Police Commissioner Jessica Tisch already had visited the scene and identified the dead officer as Didarul Islam, 36, who was killed while providing off-duty lobby security for 345 Park Ave.

The mayor and the commissioner said he had emigrated from Bangladesh, had two children and was expecting a third with his pregnant wife.

Adams, in moving remarks, said the officer was “doing what he does best . . . saving lives. He was protecting New Yorkers.”

Nonetheless, it took Mamdani another six hours before he named Officer Islam and repeated the biographical details Adams and Tisch had revealed.

In that second post, Mamdani added that when Islam “joined the police department, his mother asked him why he would pursue such a dangerous job. He told her it was to leave behind a legacy that his family could be proud of.”

“He has done that, and more,” the mayoral wannabe said, before concluding: “I pray for him, his family, and honor the legacy of service and sacrifice he leaves ­behind.”

Fair enough, but given his past attacks on the NYPD, and his immaturity, it remains impossible to imagine Mamdani providing leadership or reassurance to a stricken police force and a rattled city at a moment of distress.

The candidate is just 33 years old, and his burn-it-all-down attitude about long-established norms and traditions, especially his socialist, antisemitic and anti-police positions, make for a poor comparison next to the splendid example Adams and Tisch offered Monday.

Both are seasoned public servants whose experience and values made for a compelling lesson in crisis leadership.

The mayor, now 64, wore the NYPD uniform for 20 years, and is seeking re-election in the general election as an independent.

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Other candidates on the ballot include former Gov. Andrew Cuomo and Republican Curtis Sliwa.

Tisch is 44, and her pedigree is impeccable in that she served with distinction in critical roles under two of the most successful NYPD commissioners ever, Ray Kelly and Bill Bratton.

Meanwhile, Mamdani is a rich-kid socialist whose wealthy parents made it possible for him to avoid work and try to become a rap artist.

Indeed, he seems never to have held an actual job before winning election to the Assembly four years ago, which should never be confused with full-time work.

One of the few things he’s done is steep himself in the toxic brew of NYPD hatred.

Recall that fever was all the rage among his fellow travelers in the aftermath of ­George Floyd’s death in May 2020 and the subsequent riots in Minneapolis and elsewhere.

As Fox News recounts, Mamdani has a nasty habit of attacking the NYPD on social media.

On June 8, 2020, while running for office, he wrote that “we want to defund the police.”

In November that year. he posted that “Queer liberation means defund the ­police.”

“We don’t need an investigation to know that the NYPD is racist, anti-queer & a major threat to public safety. What we need is to #DefundTheNYPD.”

He looked for excuses to attack the department, accusing officials of using “budget tricks to keep as many cops as possible on the beat. NO to fake cuts — defund the ­police.”

In December that year, he demanded that the department “be dismantled.”

“All this misery. All for money. In the last budget, the City Council tried to make the NYPD reduce its overtime budget by half. They simply refused. There is no negotiating with an institution this wicked & corrupt. Defund it. Dismantle it. End the cycle of ­violence,” he wrote.

See, he believes cops create violence, not actual criminals.

It’s worth noting that during his serial bloviations, violent crime was spiking. As the department itself later noted in a report.

“The NYPD in 2020 confronted a + 97% (1,531 v. 777) increase in shooting incidents and + 44% increase in the number of murders (462 v. 319) amid the challenges” of the COVID pandemic.

It went on to concede that “burglaries increased by 42% and car thefts increased by 67%.”

The 2020 crime wave took place under Bill de Blasio, aka Mayor Putz, the worst inhabitant of City Hall New York has had in decades.

Naturally, the Putz also had a terrible relationship with the NYPD.

Hundreds if not thousands of ­officers showed their disdain by turning their backs on him when he spoke at the funerals of slain officers.

The first incident came early in de Blasio’s tenure during rites for NYPD patrol partners Rafael Ramos and Wenjian Liu, who were slain in December 2014.

The second came three years later, when the mayor left New York the day after the ambush killing of Miosotis Familia, a 12-year veteran of the force, who was shot in the head while sitting in her mobile command unit in The Bronx.

After her death, the mayor jetted off to Germany to participate in a demonstration against the G20 meeting of world leaders.

He defended the trip, saying “it was important to let people in other parts of the world know that many Americans disagree with President Trump.”

“This was a particularly meaningful moment,” he insisted, saying people needed to know “that the cities of America, that the states of America were not going to follow along with President Trump on issues like climate change.”

He returned and spoke at the police funeral, but many of those in uniform were furious and turned their backs as he spoke.

Later, a police union official said the mayor’s “compass led him to Germany rather than the Grand Concourse.”

“He should have been here with the family . . . He should have been there with us,” the official said.

How predictable that Mamdani has called the Putz “the best mayor of my lifetime.”

Even more chilling, reports say that refugees from that failed administration are flocking to Mamdani’s team, and some are said to be giving him advice in hopes of returning to City Hall if he is victorious in November.

For the city, that would be doubling down on disaster.

Pray that New Yorkers are smart enough to say No, hell No! to a second coming of the Putz.