That's an acceptable view point. However, that doesn't mean FB should not be punished into oblivion. They don't get a free pass just because "someone else would have done it if we didn't" is not an acceptable defense.
> the ills of social media, and how it's often framed as a Facebook problem
Facebook is the biggest. And we have evidence of the harm it, specifically, causes, in a way we don't for its competitors. They also have a spectacular track record of lying and lawbreaking.