You would be right, except when you are not.
How long does it take a rogue interface to extract a database? How fast does this "stink loop" you describe take to resolve itself?
As long as the former can happen in seconds and the latter takes days, it's not a meaningful protection.
Anyway we can disagree to degrees on that. It's no big deal.
But your larger assumption is more interesting. Just because FB has 600 million users does not mean it's a productive target just waiting to be freeperized.
Certainly there are potential "skulls full of mush" there which might be exposed to conservatism, but in my humble opinion, this page illustrates why using FB to promote conservatism to these 600 million is absurd.
It's like "Avatar does historical biography."
If you have a message to send out the largest possible audience is a good target. That’s why companies buy ad time during the Super Bowl.
I don’t see how the Edmund Burke page renders that “absurd”.