What if you don't get money from your parents and you are too mentally ill to work? Some people don't have much options other than suicide. Some people have problems that they can never fix either, and that fact can leave a lasting uncomfortable sensation that doesn't go away. Some guys feel that they let down their family, because they are either too ugly, too mentally ill or too autistic to be a functioning part of society and the feeling of shame alone makes them want to kill themselves.
I know for a fact my family and society overall would be better off if I was dead. In fact they probably want me to kill myself.