I care about all motives.
Suppose the shooter really was gay. If his father hadn't been an anti-gay bigot, would he have been so easy to radicalize? He certainly never would have abused his first wife, as he wouldn't have married a woman in the first place. Maybe if he'd been raised in a loving household, he could have loved others, instead of wallowing in a mire of hatred, for both himself and the world around him.
Perhaps there's another boy somewhere, in torment because his father believes he's disgusting and perverted. Maybe that boy can be helped.
I'm sure plenty of people will be looking into terrorism, radicalization over the internet, watch lists and so forth. But, I think it'd be a good thing if we also looked closer to home, too.
When 14 bright young women (engineering students) were murdered at the Ecole Polytechnique in 1989, Canadians were forced to face the poisonous sexism and resentment that fueled their killer's actions. I can only imagine how much the people who died in the Pulse had to offer the world, and how much we've lost due to their deaths. I think the least we can do in their honor is consider ALL the motivations, and look for ALL possible solutions.