Arghhhhhh, I agree with InACorner, some research might give you better insight into this problem and all the misconceptions around it.

Soooooooo many, tooo many reasons exist for why. Everybody has their own set. Their own personal pain and story behind the development of how/why they SI. Often we haven't learned the appropriate coping mechanisms in EARLY childhood. It's not like a scientific study can be done, the answer found then *poof* we get a new drug or treatment or "cure". The reasons are intricate, personal, scary, painful, intimate, intimidating, haunting, controlling and on and on.........

Assumptions are ignorance. Ignorance fuels negativity and we are here to help eachother and support eachother because many find us "weird", "crazy", wanting "attention".

We want to be understood, and we want to get better, we are puzzled by this SI we are stricken with and its not so easy to assign reasons without careful consideration.

Knowledge is for those that aren't afraid. There are great websites out there, find them, read people's stories and you may find your answers.