Earlier quoted context omitted.
Americans are unable to comprehend it in the same way that the civilised world cannot comprehend enslaving another. Just as enslaving others is wrong, limiting free speech is wrong, and inherently contradictory. Limited speech is not free. It is time for the rest of the world to understand this, and the US could use a refresher as well.
Not even the USA permits unlimited free speech. Memorably the US once limited speech against speaking out against conscription - under the 1918 sedition act - which led to the now famous free speech quote of "calling fire in a crowded theatre". The US still has a crime of, and recent prosecutions for sedition! A crime abolished as a relic in some other places. Pot, kettle, black? :)
The US constitution is very clear in its wording on free speech: "Congress shall make no law [...] abridging the freedom of speech". It is unfortunate that our judiciary has chosen to turn a blind eye to this and many other affronts to the rights of American citizens.