Depends on your definition of 'sane', really.

Honestly...some people can't take life and respond badly, for the most part. And, it seems to just build and build. Therefor, the only, sensible, way out is to kill themselves.

Some sane, depressed, people, just really need to be taken aside and hugged and helped, once in a while to feel better. Otherwise, yes. They ARE, indeed, sane.

...Just feeling like the world is dealing them some aweful stuff, at the time.

...I really hope that wasn't confusing. XD

False.

sane and insane people do and don't commit suicide. these are two different things. people who have severe mental illness are indeed at increased risk of committing suicide. but, the vast majority of people with severe mental illness don't commit suicide. prisoners just convicted of capital offenses and the like; people just diagnosed with a severe, chronic, degenerative disease; people in combat / torture; people who just lost a loved one are all at increased risk of committing suicide.

I think that's an iffy answer

false

False. Many sane people choose to end their lives for one reason or another. A good example would be when a sane person has a terminal illness that would kill them slowly and painfully, leaving them a shell of their former self at death but instead chooses to die on their own terms. Some people write living wills and such when they are perfectly sane so it is harder to question their choices later on if they do become seriously ill or injured.