Why do some people think only gov. has power to make and enforce regulations?

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I have been wanting to comment on this issue since I posted a discussion on gun control. Everyone who responded seemed to think I was just another person wanting to give the government more control over who owns what sort of guns. While I admit that with all this shooting madness taking over the United States or, what seems to me to be taking over anyhow I think that some increased vigilance is a good idea, the thing I was most struck by was the idea that nobody but the government or its designated officials can tell people in America not to do things. To my mind, this is patently ridiculous. A vast amount of people can say and enforce the rules as they wish them to be. I, for myself, and enforce who does and does not come on my property, work for me. A business can hire whomever it wants as long as it doesn't break any rules around discrimination. For example, it is perfectly legal for a business to fire a blatant racist, if he or she can’t keep their opinions to themselves and it bothers other coworkers or customers. However, in America, it's perfectly legal to be a blatant racist. In this case, the business owner has the authority to enforce his or her views of a healthy working environment, which do not include employing this person. The same applies to schools or other places of business who may not want someone like Al Qaeda to come and speak or fear they will be judged as condoning Muslim extremism. However, the US allows Muslims and any other extreme religious group to gather, worship, and even protest in ways and many people find horrifying. Therefore, I don't understand how any person can believe that all such authority rests in the hands of government or its designees. It clearly doesn't. A vast amount of authority belongs to private citizens. If you, disagree with me on this, can you please explain your reasoning? I have wanted to discuss this issue for a longtime and, although I am saddened by what, gave words to this discussion being formulated, I look forward to a civil and enjoyable discourse.