It also might possibly bring Facebook + Google more revenue because the groups paying for these ads have to target a blanket of people in order to hit that micro demographic they're targeting now.

+1. Also it removes the ability to send contradictory messages to different audiences.

It also removes the ability to target problematic messages to audiences which are more likely to receive those messages favorably. Which is good!

For example, if a candidate were to promise to "drive <group> out of the country", they should not be able to limit that message's visibility to audiences which exclude that group.

exactly. you force them to just deliver one message to everyone and it has to be consistent. it would force all parties back towards the political centre ground.

i hope this happens, and quick. we have an election happening here in the UK and facebook just said they're happy for the tories to use misleadingly edited clips in their ads.

a massive problem deserves a massive response and this should be it.