The shooter acted of his own free will. Yes, there were factors that contributed to his actions, but the responsibility is squarely on his shoulders. There's room for nuance, but unless he was forced to do something against his will, it's on him.

Culture matters. Environment matters. Yes he chose to commit the crime but if the environment promotes this kind of thinking/behavior then the environment needs change as well.

If he were Muslim or dark skinned we'd be losing our shit but because he's a white Christian male he's a lone wolf and it's solely his responsibility. Excuse me but I find that to be utter horsecrap.