It is entirely possible, of course, that organizers of Friday’s and Saturday’s Canada vs. Israel Davis Cup tennis matches in Halifax received very serious, very credible threats to safety at the event — which will carry on without fans in attendance, Tennis Canada announced this week. The organization cited “escalating safety concerns,” “intelligence received from local authorities and national security agencies” and “disruptions witnessed at other recent events both in Canada and internationally,” all of which it said indicated a risk of significant disruption to this event.