Ads wouldn't be a security/privacy risk if they didn't try to track people across multiple sites and build profiles on people. If ads were served from the same site as the publication and aggregate statistics were kept locally, I'd have no problem seeing them and they'd be more likely to be relevant. It isn't ads that I want to block, it's cross-site tracking. Advertisers need to figure out how to adapt or fewer and fewer people will see their ads.