Why the website instead of the ad provider? The website didn't server the ad. The ad provider did and should be the responsible part to ensure what it provides is not malicious.
Attacking a single website does nothing. If you bankrupt the site, there are millions more sites. If you attack the ad provider, bankrupting it, and shutting it down, millions of sites are now protected.
Attacking a single website does nothing. If you bankrupt the site, there are millions more sites. If you attack the ad provider, bankrupting it, and shutting it down, millions of sites are now protected.
Your logic just doesn't compute