Can someone's moral beliefs be stupid?

[Evastio]

No I would not. I am a firm believer that no person should die for the wrongs of others. In this case the boy shouldn't throw his life away, instead he should be approached by others that will help him/her realize its not a sin and its not something to kill yourself over.

You get one life, and ending it because of beliefs others have made and you have adopted is wrong and ending it because of the beliefs of others is also wrong. I'd go as far as saying your assisting someone's suicide.

That's where the

It's okay if you try to convince him to stop

part comes in. But even if he still refuses to stop commiting suicide no matter how much you try to convince him, you shouldn't try to force him to stop.