True, which means we probably should take his comments with a grain of salt.
What I find interesting is how little there is on this guy, especially in this day and age. I mean the media really only has two pictures him (that I've seen). A picture of when he was younger and another picture of him with his eyes close. No social media footprint, etc.
In terms of a political motive, that could still be true. However, I would think if this was political, he would have left behind something indicating that. Also, if he was so obsessed with politics as to do something this drastic and crazy in order to make a statement, his politics should have stood out more to others.
I think two possibilities worth considering (based on what we know) are (1) he had an onset of a medicial condition that affected his mind (perhaps something he didn't even know about, similiar to the brain tumor found in Charles Whitman) or (2) he was suicidal and decided to go out by making a name for himself in a sick way.