I don't think you understand or properly read what you just quoted. There is a difference between 'justice', 'rightfulness' and 'celebration'.
He had it coming, obviously, but the tone toward it is somewhat mental.
Because you're ignorant, is why. No on is saying let's love the man and bake him cookies and dance at his funeral, but life is life regardless.
He wasn't born an ass hole, he became on, and therein lies to fact that life itself is sacred regardless of the path the person took through whatever influences along the way.