Considering that Facebook specifically markets political marketing as a use-case for Facebook, including a neat little marketing site with a how-to guide[1], I think it's going to be difficult for Facebook to claim ignorance on this when regulators start knocking at their doors. Yes, they could say that their platform was being used outside of their intended use-case, but that they didn't even attempt the bare minimum to prevent abuse while actively seeking customers for its political influence machine is fairly damning.

[1] https://politics.fb.com/

How is that different from any other media platform? TV, radio, print, would all do the same thing. They clearly need more scrutiny on such ads, but otherwise it’s the same sales pitch as any other media company.

Would they? I don’t think they address the real problem here.

Simply using social media to campaign has never been the issue. There was never backlash against Obama for doing so. There’s precious little backlash against Sanders. The only real backlash has been against Trump, and aside from being Donald Trump, the only difference is that many of Trump’s social media supporters were secretly backed by the Russian government, and I don’t think transparency requirements would have stopped the Russian government.

It's a culture of apathy to everything except legal threat. Look up the beginnings of Google Adwords. The only thing they cared about initially was launching - forget everything until someone threatens you with a lawsuit.