I'm not a big fan of the legitimizing violence, personally.
I think the identification of the problem as liberalism's impossible position between the oppressor and oppressed is spot on. But, rather than giving into endless violence, I'm prefer extending the precepts of liberalism without exception.
Liberals always make exceptions. For them, only the worthy poor deserve help, worthiness being arbitrarily determined by some pseudo-philanthropist laundering their savage public image through charity, for example. In the public sphere, we've been convinced that means-testing is an efficient way to distribute goods and resources, never mind the arbitrary power administrators have over those they administrate. Always exceptions.
So, just...get rid of exceptions.
Did you just read the first line of what I said?