Justin Mohn has “been ranting and railing about the government for 10 years now and how they’re out to get him,” ...
And
Justin Mohn, 32, ...
He was at least 22 when this started, maybe earlier. That's kind of the prime time for symptoms of schizophrenia to appear, and it can happen to anyone, even you.
It is no secret that culturally approved magical thinking can mask those symptoms at best, and encourage them at worst. Religion is magical thinking, and for the last several years, so is right wing politics.
No matter who or where you are, especially when you're in your 20s, please take note of magical thinking in your own head, and check in about it with professional mental health care. This is doubly important if you are also surrounded by and influenced by other kinds of magical thinking.
Mohn is absolutely responsible for his own behaviors and actions, as are we all. But it would be irresponsible to remain blind to understanding the circumstances that brought him to those actions, so that we can take preventative measures to avoid this in the future.