God hardened Pharaoh's heart forcing him into a course of action. God has about an hour to soften the shooter's heart but didn't. Either a) God doesn't exist at all, or b) God didn't care enough to intervene. Either way, God isn't worth our worship because he never does anything for the benefit of his worshippers. ...Unless you wanna make the case heaven's better than being alive and everyone who meets a premature death only looks bad to us, but to them they're in heaven now and ok with it.
Okay man....

You presume you can understand these things...I don't.
Choice exists, I do know that. The shooter made an extremely fucked up choice. Why in that church.....why were those specific people hurt? I don't know....but then....neither do you.
The true complexities of the Universe are so vast, I do not pretend to understand. Our science knows next to nothing....particularly how systems or fields truly interact with the others.
Try humility....okay. Let this shit go and offer yourself up to the Deity. It might surprise you.