Greetings,
I believe there are two types of suicide; one type is a decision made entirely by oneself to end your own life, at the time of the decision you are both rational and of sound mind and have contemplated and understand the consequences, the other type of suicide the individual is not rational and unable to reason his/her way out of a very powerful and overcoming desire to extinguish his/her own life, I believe in this second case there is another alien force involved, a demonic entity, the individual may try to fight against this, the demonic force may use various means to get the individual to suicide, the individual will try desperately to overcome the desire to suicide, success or failure is dependent on alot of factors. In the second case the human individual is definitely under spiritual attack.