Yes, he was a human being. With all of the associated rights, responsibilities, and various other baggage that comes attached to that. Dehumanization of the other is exactly what leftists are upset at conservatives over, and is what leads to situations like present day Palestine and Israel, where people are killed en masse with no remorse. The IDF is reportedly having fun murdering civilians. The only way that happens is that they are taught these Palestinians are not people, they are animals. This is what it leads to.
Was Charlie Kirk a piece of shit scum fucking loser who deserved exactly what he got? Yeah, absolutely. I will not shed a single tear over this man's passing and I wish they shot him an additional time in the knees first.
But he was also a human being. No matter how disgusting our opponent we should not stoop to dehumanization. If we must kill them we must kill with a heavy heart. To do otherwise is to dehumanize yourself.