Simple. You pay money to Google to advertise so you get a pass.
2) Imagine a newspaper that publishes a list of business in its justification and has a big label next to them stating "Harmful" to consumers.
There would be lawsuits galore for defamation.
Google gets a pass for pulling this more than once.
Think of all the wasted man hours that Webmasters world wide expended trying to fix a problem that did not exist and visitors who added those websites to the mental list of 'do not visit in the future'.