Not a stupid question at all!
1. Because if I want to irritate people with my stupid opinions then I’ve got my family. And when they block me I’ve got the wilmott.com forum to fall back on.
2. At my age I have to be careful with my blood pressure.
3. I have my ego under control.
(But I do browse Twitter. It’s the fastest way to see who is an idiot, or paranoid conspiracy theorist, or smart, funny, good in a crisis. Or on vacation if I were a burglar.)