The restrictions on speech in the US a much narrower and more clearly defined than in the UK or Europe, where there is an ever changing and unprincipled perspective on what speech is allowed. In the US you cannot directly call for violence but you can do a lot of other things and you can see the case law around this in Brandenburg v Ohio and other such cases. Vague restrictions like “hate speech” are meaningless in US law (since obviously such labels can be weaponized arbitrarily) and journalism is protected without restriction. Whereas in the UK, sharing a video of the riot is apparently enough to get yourself arrested by gestapo at the doorstep.

To offer more detail on how far the Brandenburg case went in protecting free speech rights: it ruled that seditious speech – including speech that constitutes an incitement to violence – is protected by the First Amendment to the United States Constitution as long as it does not reach a level "where such advocacy is directed to inciting or producing imminent lawless action and is likely to incite or produce such action”.

The exceptions are far more narrow than in the UK. Try and bring a libel charge in each country.

PS: And technically, afaik, it isn't a crime to call for the assassination of the president of the US. It's illegal to attempt it, and to take actions that support those attempting it. But if you just post on Facebook about it... you'll get a call from the Secret Service and a recommendation that you don't do that, but no charge.