A classmate said that they collaborated on a project on JFK’s assassination and he was obsessed with the topic. I think he just wanted the infamy. Also it is pretty clear to me at this point that there was no strong political motive. He left no manifesto and did not even have any extensive political history on his devices.
Forgive the FoxNews link but this video is the best I found: https://www.foxnews.com/video/6358301112112
I find meeting people at all to be the biggest hurdle.