I see no celebration. An opinion.
I did not know who the young man was until he was already killed. It is horrific but from I have learned of him, one of his things was freedom of speech and thought. His weapon of choice appeared to be debate. I like that, not enough of it. If you are a supporter of his, surely you would engage rather than attack?
That said, I'm just an ageing London Firefighter. What do I know of US political scene.