I'm not sure what I said is a straw man. I was being a little flip, but I think it's a normal human impulse to blame "that thing" or "those people" and to feel that a problem can be fixed by just eliminating whatever that is. Maybe nobody is explicitly saying "if we eliminate Facebook the problem will go away," but I do think some people implicitly feel that way.
The deeper problem, in my view, is that network technologies encourage our tendencies toward runaway group think and villainization due to their effect of disinhibition (making us react to something more quickly than we can rationally think about it).