I TOTALLY understand why some people commit suicide.

They just get tired of feeling bad all the time.

And on top of that, they feel guilty for feeling bad.

AND you can't really talk about it except with other depressed people because everybody else shuns you if you try. They might get brought down or they feel helpless.

Better to just leave the depressed person alone.

So, now that person is depressed and if lonely, probably feeling even lonelier. Great!