People in general want a boogeyman to point a finger at. Being able to point a finger at someone's religious deity of choice or political ideology as a reason just makes it more palatable and gives them something to argue their point about. What they are missing is that when someone commits an atrocity like yesterday, it doesn't really matter if their reason was political, religious, bullying, bigotry, trying to impress a celebrity or if they think their dog is leaving cryptic messages with his Milk Bones, the main ingredient is a 55 gallon drum of concentrated, industrial strength bat shit crazy....and we need to do a better job of identifying people with issues and taking action to get them help and seeing to it that they can't have unfettered access to firearms.
Last November, a former coworker of mine had been having issues that landed him involuntarily in a mental facility for a few weeks. He was released, but continued to have issues. His family tried to get him to seek help, but he wouldn't have any of it. I saw him at a retiree picnic in August, and he was really off the rails. What used to be a laid back, slow talking country boy who always got along with all of us was now rambling on nonsensically about the bible as fast as he could talk and to as many people he could corner and talk to. Two weeks later, I saw where he had been arrested for aggravated stalking. Then in early November, he got into an argument with his neighbor, and they called 911. He was inside his home when they pulled up, and he stepped out as they came up the sidewalk and pumped two rounds out of a shotgun into the two officers, then ran back inside and barricaded himself in. After a couple of hours standoff, he shot himself. One officer was slightly injured, but the other one had to have multiple surgeries. Here is a case of someone who was identified as having some serious issues, but aside from a few weeks of required therapy, there was nothing else. If they had bothered to remove his guns from his home at least until they could get him straightened out, those officers wouldn't have gotten shot, and he would probably still be alive.