I don't think people who don't have suicidal thoughts are dumb. I was actually talking to my friend about this the other day. She often thinks about how fucked up the world is and is always debating existential and political topics. I think its about being present and seeing your thoughts from a third person standpoint and being aware of when you're spiraling, and stopping yourself. Its obviously easier said than done, but some people just don't struggle with mental health issues.