It's unclear what happened, so speculating is useless. He has spoken in support of her in the past, has basically the same political positions as her as far as anyone can tell, so to go from that to this is not something which can be reasoned about. I think there's a desire to shoehorn this as a political thing but honestly I feel this is a mistake.

Instead of ignorant (as in, we don't have the relevant information) speculation, please leave time and space for those charged with investigating the matter, to do their job and report what they find.

Wild speculation only fuels exactly the kind of madness that leads to this violence. Please stop.