As well as the authority of the person spreading it.
The fact that we've decided the President is above libel, slander, and felony charges is a new thing. Thank god people stopped this nonsense when he started advocating terrorism. Equality under the law, implies MORE scrutiny for the powerful. Unfortunately, up until this point we have normalized the opposite.
It seems like most societies have some kind of a reflex towards monarchy. We elect our leaders but still treat them in many ways like monarchs who need to be revered rather than like people we hired to do a job for us.
Falsehoods that lead to this situation.
People who post beheadings on Twitter should be banned.
People who incite violence should be banned.
Nothing was said about U.S. Presidents.