Only one guy I know ever committed suicide. A friend of mine. Security Guard at the high school I went to. His wife cheated on him, and it broke his heart.
He got drunk every night for a couple weeks before he did it. We talked about it, he just got obsessed. He talked about the fact they didn't have any kids, and that was good. I didn't know what he meant by that (or maybe I did, and just didn't think it was my place to interfere). Now I wish I had.
He went on a hunting trip in northeast Missouri, and while he was out there with his cousin, he took his .30-30 to his mouth.
I went to the funeral, and they tried to fix him up, but it didn't really look right.
People that kill themselves because of terminal cancer or because of some other reason (maybe just old, and in pain), I understand. But finances, the actions of other people, a spouse, significant other, or children doing something bad, doesn't make since. No matter how deep you fall, as long as you have life ahead of you, suicide is a waste.
As far as the cultural thing, most Asian cultures have rediculous suicide rates (look at Japan, for instance). Some reasons are good, but honour is no reason, nor is depression.