From experiance of other people, wanting to commit suicide can be completely irrational. From someone outside looking in like i was it can seem totally non-senseical and honestly i still cannot understand anyone wanting to commit suicide.
Isnt hard to understand, you just have never felt it more painful to live than pleasurable for a long sustained period.Wears you down over time.Most of the time people dont actually want to die, they just want the pain to end, there is a difference between the 2.