I do think there's a streak of insanity in those that go these lengths to celebrate a defeated leader and regime. Still, what I see here is people interacting with each other as civilized humans and not animals.

is allowed to go ahead

The part they will never understand, this must be allowed to go ahead and is a cornerstone of true free speech. They aren't damaging anything. They aren't closing off streets. They aren't being aggressive. The worst than can come of this is some hurt feelings, and that's not real injury.