In these soul-crushing days following the assassination of Charlie Kirk, we should be uniting as a country to emphatically reject political violence.

Instead, the left continued its celebration of murder and mayhem Tuesday outside Manhattan Supreme Court, where Luigi Mangione appeared before a judge in his case.

In December, Mangione allegedly murdered a man he didn’t know, UnitedHealthcare CEO Brian Thompson, in cold blood on a New York City street.

The accused killer instantly became a hero for those with poorly formed ideas about healthcare policy — as well as lonely women who think the 27-year-old is hot.

The reaction to Mangione’s act has exposed a real sickness in our country.

Some of the crazies camped out all night just to catch a glimpse of their hero, a guy they worship for murdering a father of two as a political statement.

Some wore Luigi costumes from the Super Mario Bros. video game. Others sported T-shirts featuring Mangione’s face in a heart, or portraying him as a saint in robes and a halo.

They waved homemade banners and signs: “Healthcare is a Human Right.” “Luigi Before Fascists.”

They justify the killing of Thompson — just as others justify the murder of Kirk — as a moral reaction to their jobs or their words.

Anything goes when the left gets upset. They can burn cities, kill fathers and make videos celebrating it all — and the rest of us are supposed to just take it.

The reality is, the murder of Charlie Kirk was the inevitable result of increasing leftist bombast and hysteria.

In April I wrote in these pages, “It certainly feels like a powder keg, as violence is excused and celebrated online as never before.”

The killing of Brian Thompson, and the celebration of Luigi Mangione, was the tell.

But there was more, much more: There were the two assassination attempts on President Donald Trump, and the Democrats’ muted reaction to them.

The firebombing of Tesla dealerships because Elon Musk tried to reduce government spending.

The hundreds of attacks on ICE and Border Patrol agents.

The guillotine imagery, “8647” messages on T-shirts and spelled out with shells on beaches, speeches by Democratic politicians calling for “war” or “fighting in the streets.”

And Democrats aren’t doing anything to stop it.

It would be nice if they would take this opportunity to de-escalate and say, pretty simply, “We oppose murdering people with whom we disagree.”

Sen. Dick Durbin’s both-sides statement in a Judiciary Committee hearing Tuesday — “Republicans are not Nazis, and Democrats are not evil” — was too little, much too late.

In April, a Network Contagion Research Institute report found that 55% of left-leaning Americans said political violence is acceptable.

“Assassination Culture,” the report’s authors put it. That’s what we’re living through right now.

A YouGov poll just last week found that 34% of liberal or very liberal people say it’s acceptable “to be happy about public figures’ deaths.” Only 7% of conservative or very conservative people agree.

So Democrats need to own this.

Assassination culture can only end if the left polices itself.

Democratic leaders have to grow a spine and utterly reject the left’s killers and those who love them — or this violent moment in America will keep spiraling.

Karol Markowicz is the host of the “Karol Markowicz Show” and “Normally” podcasts.