Only a small minority (3-5%) of acts of violence are attributable to mental illness: https://www.vox.com/platform/amp/2015/10/1/18000532/gun-viol...

edit: Even most mass shooters are not mentally ill: https://www.washingtonpost.com/local/most-mass-shooters-aren...

A lot of gun deaths are suicides. Those are mental illness.

But there are categories that are just idiots with guns, like people who get into fights outside bars.

There are also a surprising number of men who murder a woman who is pregnant with their child because they don't want the baby to be born.

Sometimes murder is just murder and there is no diagnosis. Not all aberrations in society are mental illness.

"These massacres are not natural disasters, acts of God, or random. They are totally predictable, direct consequences of the choices made by Greg Abbott and the majority of those in the Texas legislature," O'Rourke wrote to supporters in a Wednesday email.

Don't get me wrong, I think there is a case to be made that they might be, but good luck being a conservative politician who says all veterans are mentally ill.