It's not a law of physics that dictates that you must be allowed to operate cars at a speed that you feel is actually useful. There are plenty of things that c

It's not a law of physics that dictates that you must be allowed to operate cars at a speed that you feel is actually useful. There are plenty of things that could be useful, yet aren't in the context of civilized society. For instance, shotguns are useful for killing squirrels. That alone doesn't grant someone the right to use them that way at any place or time. "Wishing" people into crosswalks is also not a practical solution.