I want to ask the "Free speech" defenders on this thread, if the political ads are properly labeled and FB offers me a switch to turn them all off would it make you happy?
This is even more the case for narrowly targeted, and particularly negative / dissuading advertising. A chief tool and complaint in recent years has been of suppressing voter turnout, at times through issue advertising, but also specifically by spreading disinformation about candidates, voting processes, locations, times, and requirements.
Simply disabling advertising for a narrow range of users capable and motivated to block ads does not protect against the social consequences of such activities.
That's from someone who's not a free-speech absolutist.