"I think he was a deeply troubled person with serious issues that will come out that triggered him to snap like a twig in a hurricane."
I disagree. With all the planning and logistics being involved, this guy's brain did not just wake up psycho one morning. This was as well planned as anything the Jihadists would do. Not saying he is of their ilk, but he put a lot of thought into this, and had a specific date and target in mind.
Personally, I think he is just one more crazed anti-Trumper.
Not all who snap do something without planning. I am not talking temporary insanity, I am talking about a burden he carried became too much (in his mind) & he sought to lash back. In his case he wanted to go out with a big event that wold leave a lasting impression of him. Most likely directed at one person in particular. Not saying you are not correct, just saying that I believe we will find out there was a trigger that finally set him in motion to commit this heinous act. One thing is for certain, he did plan it out, and part of his plan was his taking of his own life after inflicting as much pain on as many as he possibly could.
Since he chose to do this when his girlfriend took off for the Philippines it may involve her, such as she told him she was leaving him. We know he was a high-roller but not sure how he had fared with that over time, but I doubt that really played a part. It had to be something on a more personal basis, in my opinion.