This is a perfect example of bias. The right is "fighting back in self defense", making the demonstrations turn "more and more violent", but the left is "responding" by "increasing its level of force".
The left is not "responding", they are escalating. The order of presentation and the words use deliberately make it seem the right is the cause of the violence, because they refuse to be punching bags any more.
If the article did not mean to convey this impression, the writer needs to seriously consider relearning English.
Great point, except that "the right" is not really "fighting back" in any significant way I've ever seen.
More important, "the left" is not even "escalating" these days, they are now just as insanely violent as they have always been, for as long as I can remember.
But your point about media bias is spot on, only a weeeee bit understated. ;-)