The thing that ticks me off is that there hasn't been conclusive evidence that actually justifies this ban. I'd be perfectly happy if the CIA came out with documents of how the data goes to China, but all I've seen is evidence to the contrary (e.g. servers in US, headquarters in SG etc). If I'm wrong, I'd gladly look at some linked articles of course.
Both the US government and TikTok/ByteDance are unable to prove their claims, and likely, neither one ever could. Even if TikTok showed 100% evidence that they've never done that, the US government would know that there's nothing stopping TikTok from doing it at a later date.
This legislation is the US government deciding that the risks are too great, and so they're willing to take the gamble and shut down a company that's potentially done nothing wrong. "Innocent until proven guilty" is typically reserved for the judicial system, but this is a legislative decision; it'll be an interesting court case to determine if the US legislators are able to make these sorts of decisions outside of the judiciary.