Anyway you slice it, it comes down to a fundamental truth....
If someone with a gun wishes to abuse you (for whatever reason, or under whatever color of abused authority), you have a much better chance to resist him if you are also armed, than if you are not.
This is the fundamental truth, whether you love guns or hate them.
Some people react to this truth by arming themselves. Some react by trying to disarm everyone. Neither reaction is 100% effective, but I prefer the former to the latter... since the latter tends only to disarm the law-abiding citizen, and not the thug or the oppressor.