Am I missing something here. You think a city or a state is liable because someone trips on a sidewalk or a step? Or are you saying the govt might be liable if there is a riot?
The only reason people think liability is such a big deal is because a bunch of money hungry people and their money hungry lawyers have convinced a bunch of moronic judges that people just cannot be responsible in any way for their own stupid! We have created a society of 'somebody has to pay' for any mistake I might make.
I think it is time to change this culture to one of personal responsibility. If someone jumps a fence and then hurts themselves they do not get to sue. If I beat the crap out of a burglar in my home he doesn't get to sue. If you trip over the friken sidewalk because your clumsy or stupid you don't get to sue.
The only way the liability game will ever stop is if sane and reasonable people stand up against the stupid and their cash-grabs.
Joke: Why don't snakes bite attorneys? ................ Professional courtesy.
The lawyers have changed our world, sometimes their motives are sincere and really want justice, it most cases they are just looking for money.