evince
Truthmatters
Points that easily demolish your position:
1. Anecdote is not evidence.
2. Just because someone is a mass murderer doesn't make them mentally ill. Evil people exist in the world. Those wanting revenge for personal grievances aren't necessarily mentally ill.
3. The individuals you list were not necessarily politically motivated, and those that were are not necessarily mentally ill. They could be considered terrorists acting in a rational manner that chose evil acts against their enemies.
Thus, your argument is invalid on every level. Nothing you posted shows they were mentally ill. Rather, they were simply evil people committing rational acts of violence.
On the flip side, a clear case of mental illness is expecting people to act in ways they clearly won't.
For example, most people are not altruistic all of the time. Most people are altruistic occasionally, and usually when they see no particular downside or cost to acting such. Yet, the Left as a primary staple of most of their political positions expect people to act willingly and openly altruistic all of the time even when it is highly detrimental to their own self interests. That is a mentally ill position. Expecting something of others that you should know obviously isn't going to occur yet expecting it anyway shows a lack of awareness or denial of reality. That is mental illness.
A huge vat of failsauce you just typed