Parent is not claiming that protesters generally gain support for their own cause. Parent claims that protests shift the Overton Window such that more reasonable stances can fall within and gain support.
Yes. Thank you. And actually, when you have a non-politically charged conversation offline with some of the political operatives that cause these bridge shutdowns, they will admit that this is their goal as well. They know it's ragebait, but bait nonetheless.
Those are the same argument. The idea that “I’m the moderate and if you don’t vote for my position, you’ll get the extremist” is a form of blackmail.