Why do People Want to Control Other People

I don't mean on a personal level, I can understand wanting to have effects and even control them, I mean controlling how complete strangers act when it has no effect at all on the person who wants to control them.
I read debates on the Internet often, and one of the most obvious examples of this was on helium.com, which asked it skin bleach should be made illegal and a vast majority of people said yes. I searched the Internet trying to find some hint of why it was dangerous, but I couldn't find it. So far as I can tell these people wanted skin bleaching to be illegal because they didn't like the idea.
I don't like it either. There is no reason that someone should have to use bleach on their skin to feel better about themselves but I don't have to agree with people to believe that they should be allowed to make their own decisions.
Most people would agree to the same thing if you put it that way, but the next time they are given the opportunity to tell someone how to live their life they will do so and not just giving opinions they will force that opinion.
Many of the ways people do that seem benign but they are symptoms of a bigger problem. Tax exemptions for example seem completely benign on the surface but that they really are is the government telling you that if you spend the money in they way they want, act the way they want, they won't charge you so much.
Freedom must be the ability to make mistakes or it isn't anything. I want my freedom and I want other people to have theirs.