Trump thinks people who do mass shooting are mentally ill, when they are uniformly marginalized, some due to mental illness, personality, social awkwardness, or by choice of not associating with the main stream idiots. It is the marginalization that must be prevented, if we are to find a social solution. Now preventing social marginalization is a concept for study, but in reality, we conduct behaviors which we are compelled to by our opinions and beliefs. We do not like to associates with people who hold different views, so as the diversity of our culture grows, the amount of alienation grows. I will not voluntarily associate with the religious, for they do not live in reality, and as such, marginalization is real and by choice. I do not associate with the party crowd, as they are wasteful of a scarce resource, money, not the food pushing bunch. How would I not be socially alienated? But I understand this, so the world has nothing yet to fear from me, but just do not piss me off.