I’m from USA. On the same page with you here about the collectivist vs individual freedom. As you noted it’s a tragedy of the commons—-because unquestioned individual freedom is prized so heavily in USA, some dog owners take advantage of it without appropriate precaution, and those people tend to do things like call the police on black people, or scare and injure children by accident with their dogs, and these incidents correspondingly build our stereotype of off-leashers. Ironically this also leads to laws and rules and a general social attitude that restrict our individual freedom to walk dogs off leash.
In that way, Europeans are more ‘individually free’ on this topic because, as you note, off leash dog walking is totally normal over there because people wouldn’t think of doing it without appropriate control of their dog. Interesting to think about the tension and paradoxes between individual and collectivist freedoms.
But, you probably have some annoying dog tax ;)