Are mass shooters even mentally ill?

i always see that "its just some crazy nut." not all crazy nuts are violent and are often not. its most def twisted people in a way where theyre not insane. but are just bad people.
Updates
+1 y
1. It's not fair to say they're insane. because insane people dont often do this.
2. having symptoms of mental illness does not make you insane.
3. evil does exist, and thats what these people are. they are often just evil and dont have voices telling them what to do. all you have to do is look up the kid who committed a mass shooting and pretended to be insane.

these mass shooters are twisted human beings, they are not insane.
Updates
+1 y
mental illness is a stigma, and these people who do these kinds of things suffer from mental illness, but theyre not clinically insane. they are just down to the core evil.
Are mass shooters even mentally ill?
Post Opinion