Earlier quoted context omitted.
It's my computer, I pick what I want to display and which code I want to execute. If you really wanted to take a principled stand you just wouldn't use those web sites. Ad blockers are just lazy activism.
What has choosing what you download got to do with making a principled stand? It's like some people think that blocking ads is bad manners. I don't get it.
It's the same as taking the free newspapers in your area, cutting out all the advertisements, and giving those out to people. Every person that gets the paper without the advertisements affects the newspaper bottom line. It affects it in a small way, but all together they add up. The newspaper functions because advertisers pay them, and if there's no reason for advertisers to expect their ads are seen, then there's no reason to continue paying.