I disagree.. It's like saying people who murdered journalists in france were victim of "jounalistophobia".
It doesn't make sense to me. Shooter are mostly mentally ill / violent people FIRST at the root, and then find a motive which is picked randomly in their education.
Whenever someone says "mentally ill", what diagnosis are you giving and on what basis? The other Islamophobic mass shooter, Breivik, was declared sane by a court. These kinds of incidents are not spontaneous breaks in sanity but deliberate, premeditated crimes planned out like bank robberies.
> "jounalistophobia"
In both cases it's radicalization. The perpetrators are given some people to hate, and an encouragement to violence, and some emotional support in planning the attack.
You can absolutely be sure that you want to kill people, knowing the implications of your acts and going though with it, that makes you sane for a court.
Now is someone showing so much hate and violence mentally ill in a way? I guess it depends on who you ask. Imho these kinds of views/acts are not very compatible with my definition of mental sanity.