Comment by Someone

> And in some jurisdictions (notably the US) anybody can sue anyone for anything.

That should be the case in all jurisdictions. The justice system exists so that, if I feel treated unfairly, I can go to the state to settle the question whether/how much that is true. If there are issues where I cannot go to court, what am I supposed to do? Go fight you over the issue?

What differs (a lot) is how effectively the system rejects frivolous/unjust cases, how much time/money it costs you to defend yourself against remaining claims, and what systems there are to prevent people from going to court (having affordable care will prevent people from taking some medical claims to court; obligatory car insurance means most fender bender cases get handled by insurance companies, etc(