I guess the mindset comes from TV/Radio land where content is just dished up, and there is only one way to consume it, or you can stop consuming it.
It's probably more an issue of, we are in a difficult situation where some businesses don't know how to monetize outside of advertising (like google). And if everyone could block them, you'd effectively destroy businesses like that.
But on the flip side, the advert business model have gotten everyone used to 'free'. If google started selling "Search packs" where you get 100 searchs for $20, I don't think people would go for it.
This has nothing to do with radio or TV, this is simply trying to keep the lights on. How is a web service like imgur going to keep doing what it does without adverts?
It's a practical problem as much as a moral one. Content producers need to pay the bills somehow, and ads can be an effective way of doing that, if people don't try to circumvent them.
Its better to just accept this fact and work with it than attempt to boil the ocean.
one might also ask about what kind of entitlement an attitude like yours is bringing to the table.