It is not new to this generation and it is not confined to the United States, the world has always had a lot of senseless violence, and if you restrict it to politically motivated violence, committed by individuals rather than states, then again we can go back a long way.
The problem boils down to this — mentally unstable individuals, motivated by political rhetoric, have access to deadly weapons. It is a very difficult problem to solve, probably more promising to cut back on the dangerous rhetoric than to expect cures of insanity or a lack of access to weapons.
While the political right is not entirely exempt from cases of dangerous rhetoric (and I exclude fascism from this as a sort of third political domain after socialism and conservatism) it is obvious that socialism and its mutant variation, fascism, are primarily responsible for most political violence (then also radical Islam in more recent decades).
The left-wing political establishment need to step back and assess the effects of their rhetoric which may not be directly intended to unleash deadly violence, although you have to assume that sometimes (perhaps usually) this is actually the intent as part of a revolutionary agenda.
At this point, suggesting that “right wing political extremism” is some sort of major problem is not only ludicrous, it is diverting attention away from the real problem and that is left wing extremism.
Having “access to deadly weapons” is the 2nd part
The FIRST part is that they are NOT HOSPITALIZED and OUT of society
Give us Barabbas!