Distraction from the real issue
This is not really a Google problem. The ad agencies (like Havas) jumped at an easy, cheap placement method. They didn't do anything until it became a minor scandal and you can bet it was their customers that prompted the pulling of ads not the agency. Either they didn't understand what they were buying on behalf of their customers or they were blinded by all those shiny dollar signs.
If I were a Havas customer I'd be asking some very pointed questions starting with "exactly what the fuck are we paying you fuckers for?"
Now look what you've done: I'm defending Google. I need to go take a shower...