Nicely put. Trying to process what you mean. The way I understood you is we cant possibly be normal to off ourselves. Like, it ultimately boils to being mentally disturbed.
due to other factors.
Sorry, I may have not worded it as clearly as I would have liked. But actually not quite what you said.
I think we can be normal minded people who off ourselves..normal people in an abnormal or less than ideal situation. And that situation or experience or reason or what have you, THAT is what usually breeds the mental distress of what may otherwise be the healthiest of minds. And if that reason is permanent then these distress symptoms will never go away, the person with these "symptoms" may very well be labeled mentally ill, giving people the WRONG impression that there is something inherently amiss with their brains, when what's actually amiss is the predicament or body or loss, etc that they are stuck in.
Their only two options at that point are to continue to suffer or to end the suffering.
This is not an illogical decision, it makes perfect sense. And it is not the work of a faulty brain.
Im not saying it can't be, or that some people don't make impulsive decisions, just that on the topic of what you are seeing on this site...mental illness labels, even self proclaimed ones should be taken as just the tip of the iceberg that doesn't really mean anything until you look at the rest of it underneath. Why that label appeared atop their head in the first place is like I said...problematic, and linked to multiple issues with the mental health professionals/services, the public, and the view point of the suffering.
I would just completely ignore the label and just look at the details of why the person is suffering..there you will find the core factors that may very well line up with what you described as "other reasons".
If you see people running around just shouting the name of a mental disorder as their reason for catching the bus, take into consideration that they may have been put under the false impression that their brain is disordered by people who are part of a system which has no surefire tests for diagnosing the majority of the people who walk into their doors. (Sorry to say also that this site isn't devoid of attention seekers, so keep that in mind as well.)
They may be just as misguided as the public is about how psychology and psychiatry work. They are under the same undeserved authority and take the label to be an umbrella term for all their problems, stating it in their posts is an easy way to get the message across that they are suffering to other people, like yourself. It's a poor method of delivery obviously, as you, like many, come away with an incorrect conclusion.
It's difficult to explain in simple terms also because so many people have varying definitions and takes on the subject matter, it's messy and overly complicated when it never needed to be.