Switzerland has a social safety net and its people have a voice in politics/government. It's all imperfect but it's there.
In the US everything you have, including your health, is reliant on you constantly proving your worth to a society that is trying to prove the opposite. And any voice you have in society is nominal at best unless you're a billionaire. Politically your choices are culturally determined to be one of two parties that don't represent you and will do nothing for you because they're captured by billionaires.
In a society that's constantly trying to kill you it's easy to come to the conclusion that lashing out back at said society is self-defense. What mental health professional could you afford to talk to that would tell you otherwise?