The TOS doesn’t say anything about crimes like murder, and of course you can’t waive that anyway.
What it does say is that any disputes arising out of the use of their website are subject to arbitration. If the plaintiff is correct and Disney is liable because they posted the menu on their website, then that would be a dispute arising out of the use of their website.
If social media companies exist to collect massive troves of personal info from users–and they do–then there is a valid national security concern over social media controlled by an adversary. This is distinct from the individual privacy concerns towards domestically-controlled social media.