The thing is that the US also does not have 100% free speech.
You can absolutely get arrested in the US for shouting “FIRE!” In a crowded area.
Regarding punishment for violent crimes seeming low in Europe, that is mainly due to us focusing on rehabilitation rather than revenge. However change is comming, we are moving to longer punishments.
If I got to decide, we would have a system where we focus on rehab for the first X times a person commits a crime, when it has been shown that the person does not want to change, then they are put in containment prisons, they are less nice, and focus on containment firstly, rehab secondly.
The small brained “you can’t yell fire in a movie theater” argument so we don’t have free speech is the intellectual equivalent of Jeff Bezos is poor because he drives a ‘93 Honda civic.
Yet that is exactly your argument, that only the US has free speech because Europe puts people in jail for online comments, without regard to what those comments are, it’s the equivalent to saying the US jails people for speaking in the movie theaters in the fire example.
Free speech doesn’t not mean freedom from consequences.
Example. If you tell someone to kill someone else, and they do it, you will be charged with a crime. Free speech means that you can voice your views, and the government (not private corporations btw) is not allowed to restrict it. That’s why you can still read Luigi’s manifesto, or the Unabomber’s. It’s why you can still publish and read the Articles of the Confederacy, or the Anarchist’s Cookbook.