(NOT being sarcastic here.)
Dude, your question is reasonable, but can you really not think of any reasons why people commit suicide? Seriously.
There are entire sites and academic texts and articles dedicated solely to this topic.
And that statement about it being "temporary"--UNTRUE in some circumstances. If you're facing life in prison, that's not temporary. Come to think of it, even a few years in prison has caused MANY people to commit suicide because of the brutality and hopelessness in prison life! There are people made sexual slaves (punks) within HOURS of being in prison! And no, you can't just get out of that, and the problem isn't temporary. Even if it is temporary (after all, by definition, a few years isn't technically infinite.
That's just ONE subject regarding suicide.
Let's see what else.
Various mental illnesses such as extreme depression, anxiety, and schizophrenia.
Warfare. People have put themselves in suicidal or near-suicidal situations in warfare or terrorism (eg, Al Quaida, Waffen SS, kamikaze).
Extreme isolation and loneliness.
Lack of coping skills.
Concentration or labor camp internment.
Seriously, could you not think of any of these?
And by the way, some of these cases are NOT temporary, and even when they are, the seriousness of them doesn't make up for their temporariness (in reality or in the "reality of the individual".)