You kick kittens because you didn’t really think about it, then you think about it and you stop. Humans make errors in judgement all the time. That’s just ordinary.

Also, he himself clearly says that he doesn’t think blocking ads is somehow undoubtedly immoral (like kicking kittens) or something. He makes a much more subtle argument, basically saying it’s a complex issue and he doesn’t feel confident in his ability to make the right decisions looking forward in his stewardship of what would probably have been one of the most popular ad blockers on the platform.

He just doesn’t want to make those decisions. He feels uncomfortable making them. That’s it. I think that’s a very sensible argument for pulling the app, especially if you expected this app to be not very popular in the first place.