Say there were no guns, they never were invented, never existed. How did Cain kill Able? IIRC with a rock or a sharp stick.
If someone really wanted to commit suicide there is always rat poison, rope, cars, alcohol to overdose on, you could overdose on narcotics, probably even a couple grams of pure caffeine, you could ingest a whole container of drain cleaner, I heard the Arabs do it by eating a pound of salt. So would the logical choice be to ban salt?
Guns only make it easier to do, if someone completely lost the will to live and wanted to end their own life there are a million other ways to do it than with a firearm. Yes, a firearm makes it easy and painless. If you had a bullet going 1400 FPS go through your brain you probably won't feel it. But if a person is determined enough then they will find a way to get it done, no use in making all of us suffer. Banning guns would make murder rates go up, think of all the home invasions where the good guys wouldn't have guns to stop the violence.
Just my two cents...
Levi