I'm taking issue with the increasing prevalent view as represented in this Bloomberg article that has an unstated assumption that it's reasonable to expect or even demand that actors such as Google take measures to make these moral judgments.

If Google wants to and chooses to, great. But if they don't, I'd much rather see an article warning the public about the dangers of trusting Google ads rather than bemoaning that its easy for bad actors to buy Google ads.

And Google isn't 'helping' bad actors unless they charge them less than others or otherwise create an unfair advantage. Otherwise they're a neutral actor that is a reflection of a failed policy and/or law enforcement problem.