why is it assumed someone who commit suicide is mentally ill?!

thats a misconception, people who commit suicide are mostly dealing with stuff they cant handle n they think that suicide is the only way out but what they dont realize if they just give it awhile to cool down(the stuff thats making them think about off-ing themselfs.) and things will be back to normal, so i think who ever told u that doesnt see the world as a straight line n they get misled to believe non-fiction facts

my own opinion

Well what kind of answer are you looking for? Yes this is ALWAYS the case with suicide victims. If their mentality is that suicide is the only way out of their problems and the only answer to solve them then it is very apparent that they are not functioning right and are mentally ill. No "normal, sane" person would resort to suicide. They would confide in a friend, start a new hobby, or journal about the sad mood. Only someone who is depressed or with another disorder whether its been there or brought on by an event will resort to suicide

Well phil said it bluntly lol but it is true. If someone is comitting suicide they are obviously not right mentally.

In our culture, most people who are suicidal do have a serious mental illness. In other cultures where suicide is more acceptable, people may have other motives for suicide, such as they did something dishonorable, and in their culture, they are supposed to suicide. It is recognized that in the US, not all people who attempt suicide have a mental illness, but that isn't very common.

ill does not necessarily mean mentally challenged.
for example, if i have the cold, i am generally considered ill, even though i do not have cancer.
ill is when something isn't up and running. to want to kill your self, means that your mind, is black, upset, depressed, frustrated. all of which, not great feelings. so can be considered ill.

Because people or especially psyciatrichs (if that's how you spell it) single those people out who have depression. It is an illness that can sort of be cured using pills for anxiety and the like but it is someone who has major problems in life and needs to be cured right away in order to save a life, which is what doctors cure, illnesses meaning things that effect a person's life

because the person who killed themselves probably had depression and depression is a mental illness plus, if they did not have depression, then there must have been something wrong with their mental stability for them to have the drive to go through with the suicide.

Because it shows that the person has no self-preservation instinct that all living organisms normally have. It shows his mind is disturbed

You have to be fvcking nuts to want to kill yourself.