I like UBI but only if literally everyone gets it no matter their income level as soon as they hit 18. Maybe a slow ramp from 18 to 23. The smart ones will use it to invest, start a business, go to school, etc.
As far as "saving" people from themselves. That's a fantasy. You can't help someone who is mentally ill. Doesn't even necessarily need to be about drugs. I know plenty who are incapable of being "normal". I see this everyday on tech discussion boards like this. Pedantic nerds that will argue about how they are always right about everything but then fall for some dumb scam or end up working a dead end job for 20 years. These are the types that will blame everyone but themselves.
I've seen this mental illness in my family. One brother turns into a hoarder that is constantly going on and on about how to save $7 on sales tax by driving to a different state. Thinks he's saving money. Meanwhile the sister becomes a doctor. One is dead now. The other is watching her grand kids grow up.