Gaming

Of course.

Basically, any study of mass shootings within the last decade all always draw the same conclusion: they are not driven, as a rule, by mental illness. In general, mental illness accounts for 25% of cases (and that's for mental illness, in general) but the mental illness itself is generally incidental. But, of course, most people have a particular mental illness in mind when they mention it in this context and that's severe mental illness, generally psychosis. The previous link mentions this as only being present in 5% of cases though this other source mentions 10%.

Regardless, these are clearly minority level numbers and, even if we wanted to stretch things and pretend they were higher for the sake of argument, still well and beyond below 50% as to make saying that mental illness, primarily, is to blame – end of story – just inherently untrue.

But, moreover – and the far more important part! –, the thing that shouldn't be lost here is that the claim that mental illness is the cause has caught on as such a popular talking point because it's easier to scapegoat.

It's a simple answer that, for those unfamiliar, is going to make, supposedly, intuitive sense. The politicians like it – for much the same reason they like blaming violent media – because it doesn't force them to do anything about the actual root issues (the social conditions that drive people to this desperation or create the far right ideas that become so popular that people write entire political manifestos beforehand) and it works so well as a scapegoat because people with psychosis are foreign (and, therefore, hard to understand) for the generally (more) mentally abled population.

The fact is that schizophrenics are overwhelmingly more likely to be victimized with violence than to be committers of it; but framing violent events like these as being driven by mental illness helps to prop up the misconception and ensure that people with severe mental illness are misunderstood.

Anyway, they were close because the beginning of their comment is spot on only to settle so assuredly on incorrect information but, more over, an unquestioned stereotype that causes real harm due to it being based on erroneous information.