I support your arguments of free content, but there are some sites on the internet that will serve you spam if you don't use a ad blocking software.

I unblock ads on the free websites that I use frequently which present ads in a nice way.

Some websites do show a popup that they earn from ads and it would be great if you could turn off your ad blocker and I mostly comply with that. The reason for this is that these sites know when and where to show ads.