those who commit a (failed)suicide attempt, most probably find themselves at the edge of their sanity, or couldn't bear the pressure anymore or undergone deep depression or emotional trauma; life has no meaning for them and they blame themselves as its all their fault etc.

They obviously need Rehabilitation, not Jail ?

Ideally Jail is for those, who could cause harm to others if let free or otherwise dangerous for the society/system.

but such guys are poor victims of the system, may be they don't find themselve fit in anywhere or feel left alone or left behind ..
they shouldn't deserve punishment but care.

I know for example at professional colleges, we are so much under pressure .. it not so rare to hear suicide news from failed/ under pressure medical/engg students (specially from asian countries).

They all need help, care, sympathies ..

"if you saved one life - as if you save the whole"