Shouldn't it be "advertisers are targeting rightwing Facebook users with..."? I was under the impression that it was the advertiser who chooses the target audience.
It's obviously complete BS.
Building capabilities to add arbitrary human-defined rules into those optimization functions only makes their jobs more difficult and is a drag on hitting team targets. I'm curious why you think they're incentivized to do so.
Let's be more sympathetic to the little guys.