When I hear someone had done something bad on the news.

I always consider, maybe they weren't in a stable state of mind. They could of had a undiagnosed mental illness.

But that's just me.

I don't really get upset by people saying that the person may have had mental illness. They very well could of.

Certain mental illnesses make you irrational,paranoid, and have a break with reality.

Which could cause a person to do bad or evil things.