If you find this horrifying (and I hope you do, because there can be no moral justification for celebrating murder), then I encourage you to really think about whether we would not be better off without such extremist language poisoning people's minds. We have to try to stop escalating, or the cycle is going to destroy our society.
Yes, it's true that lunatics on both sides may use their side's rhetoric as a call to action but often this isn't even the case and they're just hopelessly confused and mentally ill people. It'd be nice if we lived in a society where those people couldn't get guns or could get mental health treatment and it'd be nice if one side of this debate didn't weaponize these common sense ideas into identity politics but here we are.