"The good news is that the ads didn't suggest US-based Facebook users vote one way or another. The bad is that they seem to have aimed to create a febrile atmosphere in the US and that effort appears to have succeeded: the 2016 presidential election featured plenty of heated debate on immigration, race issues and guns.”
So the adverts weren't interfering in the actual election, but encouraging discussion? Isn't that what democracy is all about - discussion? Is the bad news that people in the USA actually talked about immigration, race issues and guns and then came to a decision about who they wanted as their president afterwards (or not as the case may be)?