Earlier quoted context omitted.
1. No they haven’t 2. There are limitations of free speech in every country, including the US. It’s a matter of where the line is drawn.
1. Yes they have. http://www.dailymail.co.uk/news/article-5715727/Police-threa... https://www.google.co.nz/amp/s/www.theregister.co.uk/AMP/201... 2. The restrictions on speech in the US mostly relate to other crimes, like inciting violence. You can’t be arrested in the US for saying something that’s too offensive (like they do in the UK every day).
You clearly are unfamiliar with the entire domain of obscenity law not in the US, which is exactly about defining what is so offensive as to be outside the scope of First Amendment protection.