That you need to ask the question sort of implies that there is 0 value to Facebook in catching that they were defrauded - if thats right, then there's nothing wrong with regulation. If Facebook doesn't have the ability to determine who is running ads, then I agree with the GP that political ads should be banned on Facebook altogether.

I'm sorry, we make people show ID to buy cigarettes and beer - mass political advertising needs SOME sort of regulation.