This does not appear to be an argument against government making gun regulations specifically, as it could just as well apply to all sorts of government decisions made in the name of the people. In fact you highlighted that fact by using your Janet Napolitano example, which of course had nothing to do with guns. Therefore what you are really arguing against is the principle of government making decisions for the people at all. That would include government making decisions about who you can hire (must be a citizen), what sort of animals you can raise in the city, how close to your property line you are allowed to build a garage, etc. Some of these decisions I think you are perfectly willing to have made by government. So if your complaint is that government should not make these decisions on principle, then you would be inconsistent.
If however you have an issue with specific decisions made by government (such as what safety standards should be followed with regard to guns) then I think you have to cite specific proposals and make your case about them, rather than against the whole principle of government deciding these things at all. Frankly, I don’t think there is any doubt that government can and should set safety standards for guns in society. However it is valid to debate what those standards should be, and to petition your government with those concerns the same way we petition the government for all other concerns over civil policy. Church teaching does have a lot to say about respect for legitimate authority acting in the common good. So unless you can prove that your government is definitely not a legitimate authority, you are bound to live by the laws of that government (unless, of course, doing so requires that you violate a core teaching of the Church, such as performing an abortion). And in the case of an illegitimate government, the Catechism gives criteria for determining when armed resistance against that illegitimate government is justified. I don’t think we are anywhere near satisfying those criteria yet.