So the political left tends to be violent, and the question is why, this op-ed discusses. The answer might be rather simple.
Violence is, at its core, an unthinking reaction to dissonant information, a sort of animal reaction to some disturbing influence. It appears when individuals allow feelings to transcend everything else, especially the process of thinking.
All human action is directed at reducing or eliminating a personally felt sense of uneasiness and what distinguishes the human from the animal is the human’s ability to abstain from instinctive behaviour.
So when the radical left feel threatened, not physically of course, but intellectually and unable to counter that intellectual challenge with an opposing intellectual argument, they then resort to physical violence to remove the threat. Essentially instinctive behaviour and thus uncivilised.
The radical left are simply inhuman.