You don't seem to understand mental health much. It's usually not as easy as "just getting help." Often the help doesn't even work anyway. You mention you can imagine child molester killing himself..... but what about the victims of molestation? Or rape victims? War vets? Paramedics/doctors who see traumatic stuff every day?
It's hard to judge someone's thoughts on suicide unless you've lived a day in their life.
I gotta say tho... the one I don't get is dentists. They off themselves at record numbers, yet are in a profession of their choosing and make tons of money. That one always makes me wonder. Shoulda became breast surgeons, they'd be much happier.