What is more difficult to understand of suicide?

We have to understand that it is not an isolated event, there is no single cause. Yes there are triggers.
Not that someone makes the decision only because he suffers bullying, or just because he left his wife, if not all people, in this situation, they would.  

There is a whole chain reaction.
 
In this also have the emotional resources of the person, support networks and if they have a mental disorder.
 
It is a disease. Nobody wants to get sick just because. You have to think like a mental cancer that develops is not something impulsive, there is a whole planning stage. Remains a disease. 

 Anyone who commits suicide does NOT wants to die,  they want to stop suffering.
 
It is not an act of selfishness or cowardice or lack of God; is the outcome of a disease.