lefties are much more likely to commit suicide than righties.

That's interesting (and tragic, obviously).

The idea that it could be an environmental thing (pressure to conform in a right-handed world, the schools and church stuff you mentioned) is quite compelling.

On the other hand, the increased prevalence of genius, and alcoholism, suggests maybe something genetic (or whatever) - like left handedness might go along with certain inherent psychological traits, which might also tend more towards self harming behaviour.

I know nothing about any of this stuff beyond a general interest, so I've no doubt it's a lot more complicated than that (and/or that this is just correlation rather than causation in one direction or another) but it's interesting regardless.