I think Google allows it because it makes Chrome suitable for more users - those that won't give up on an ad-free experience. Also, only (and definitely not all), or mostly tech-savvy users use adblockers. I don't think we represent a big chunk of the people-who-use-the-web pie.

Also, when I say 'steal' when I talk about internet content, I do not talk about anything illegal. I talk about what's moral to my eyes. I think a website, most websites, offer you a simple package: content with some (or a lot of) ads. I either take the entire package (and THEN streamline it with the Print button or some reading bookmarklet/addon) or nothing at all.

When I take the highway, I see ads. It's part of the highway experience. If I can't stand the ads I should find an alternative route, but I won't remove those ads even if it's possible to remove them only from my view, and with a simple click of a button.