The US could, if there was the political will, hold Facebook accountable for this because Meta is an American company. The US would not be able to hold a non-American company accountable in the same way. I do not see a conflict between wanting Meta held accountable for allowing things like Cambridge Analytica to occur and not minding the US taking proactive action on TikTok.
I was wrong, TikTok has a US subsidiary, so accountability can been enforced. I was under the mistaken impression they didn’t, so operating on the assumption that any accountability action would be functionally unenforceable.