I think the reason why they say “most political violence is left-wing violence” is because they want to convince their actual audience, the donor class, into supporting a fascist takeover by appealing to the “class warfare” concept that conceptually might frighten them more than a fascist USA.

Exactly along the same lines that you’re thinking, the targets of right-wing political violence tend to be protestors, LGBTQ+ people, people of color, low-level government employees…left-wing political violence if it were directed properly would be more targeted on things like the ultra-rich (aka Republicans’ real constituency).