Or at a more simplistic level, why haven't Google, Firefox et al simply blocked download.com as serving malware? Even something that simple happening far more frequently, might mean sites carrying ads gained some ethics. Maybe some of the ad networks would then be held responsible for the crap they regularly carry.
...and sites whine at the unfairness of the growing number of adblocking users. Right.
...and sites whine at the unfairness of the growing number of adblocking users. Right.