I'm not arguing against them explaining their rationale. I originally argued that they shouldn't be taken as experts.
Zuckerberg and Musk "get" to do these things because they are in the US, with majority US-based workers, running off US-based infrastructure. If any of these platforms are being used to facilitate attacks against the US, the government can choose any number of methods to step in and enforce compliance to mitigate the threat. That's it. This is about free speech in that not all speech is protected. If somebody uses TikTok to perform the digital equivalent of yelling fire in a crowded theater, the government sees a need to control it.
If Facebook was run and operated out of Tunisia, I'd expect these same conversations to be happening with them as well.