I don't even really understand why one would need to ask this question, the answer is obvious. To die is simply the preferable option to existing in this hellish world and humans have enough awareness to realise that existence isn't worth enduring. There is no benefit and nothing to be gained by staying here and having to suffer, we are all going to die anyway so I believe that for many it makes sense for them to exit at a time of their own choosing and avoid delaying the inevitable. There is no "help". Life itself is the true problem, and to exist is an awful thing. The idea that this logical truth can be "helped", is just people deluding themselves.
Choosing to die can be the most rational solution that makes sense and it's not a mental illness being suicidal. To me the illness lies in those who glorify suffering and try to justify the harsh reality of this existence. The simple truth is that all torture is unacceptable and undesirable, and I could never wish to associate with something that is as harmful as existence. To die solves everything and I believe there to be no disadvantages to being dead. No wonder so many choose to die, and I truly believe that only those who are free from this cruel, unnecessary burden called existence are the fortunate ones.