Of bootleggers and the law

There is probably almost no law which does not interfere with what someone or the other wants to do. Well, if no-one wanted to do a thing, why would you need a law to prohibit him from doing so? Like, say, a law that prohibits people from poking their own eyes out? And, if everyone wants to do something, why would you need a law insisting on their doing so? Like, say, a law to make it mandatory