They're used to organise the social graph, so the analogy is off but not actually wrong in spirit. Yes, you can gather without them, but organising without them

They're used to organise the social graph, so the analogy is off but not actually wrong in spirit. Yes, you can gather without them, but organising without them is what's difficult because again, they now nearly monopolise the social graph of acquaintances in terms of organisation (e.g. Facebook groups for a hobby, political protests where most people don't know each other IRL). This wasn't inevitable, but the analogy to me seems to be like saying: you don't need to drive when the country decided to only build roads. As for your last sentence, well, not necessarily. I just don't see how that logically follows. Bans tell you that you're violating a rule, but those rules can be terrible. That's true of anything ever, I don't see how you can state that it's always the fault of the person being cut off. That's like saying all social ostracisation is really the fault of the person being ostracised. The person who is unpopular might be a terrible person, or they might be right but with uncomfortable facts or opinions.