I would respect the Adblock crowd more if they didn’t run around describing their actions as brave or “morally responsible.” It’s ok to admit that you’re taking something without return!
No one is under any obligation to accept advertising. Only since the modern web have advertisers and content providers made this an argument on ethics.
We could all go around in circles like this for hours.
I'm not really sure what crowd of us you think claims that ad-blocking is "morally responsible". I certainly don't see it as a moral issue at all. I just don't want so see ads, period. I think they're psychologically manipulative garbage, and I don't want them in front of my eyes, infecting my brain.
If someone wants to publish something behind a paywall, I'll pay if I think it's worth the price. If someone wants to put up an ad-blocker-blocker and refuse to serve that content to me, that's fine too; I'll live without their content.
If a server is going to send me bits over the wire, I am going to decide how I view those bits, and which bits I do and do not want to see.