Life is unfair isn't it? I just drank non fair trade coffee and I feel fine.
Sending me an ad along with my article and crying when I don't display it to myself doesn't mean I've done anything wrong.
If you want to be in a position where users need to display ads to use your content, then you need to form that legal agreement with your users. You can't not do that and then pretend like I have agreed to view the ads.