I'd argue that it is an emotional decision for both, and it does seem ironic that the US would be following China in restricting a platform that people see as a major tool for free speech. Whether you agree with that or not the optics are terrible, and the users are very aware of it. If this is really a big concern then they would also ban facebook/instagram/snapchat, but they aren't being included in this, despite having a worse track record.
I think there would need to be some basis in fact for these claims, right?
Uncompelling! The particulars matter!
"enormous threat to U.S. national security and young Americans’ mental health. This past week demonstrated the Chinese Communist Party is capable of mobilizing the platform’s users to a range of dangerous, destabilizing actions. The Senate must pass this bill and send it to the president’s desk immediately.”