> Being responsible has nothing to do with not changing your mind.

Being responsible has everything to do with changing or not changing your mind. An anonymous troll can lie and say, "I never said that." A named person cannot -- he has to accept personal responsibility for his past statements and actions.

I think you're confusing different scenarios. Nobody was talking about lying. A responsible person will respond "I said that, but I changed my mind because X", and everyone should be happy. But in the problem angersock mentions, people complain, accusing hypocrisy as if everything you have ever said in your life was uttered mere moments ago.