If someone initiates force against you, you DO have the right to defend yourself. Governments don’t like this, since they are one of the principle organizations initiating force. They want their agents (aka soldiers) to be able to initiate force, without people defending themselves against their aggression.
If you have trouble understanding this, think about how you would behave, or how you would like to *think* you’d behave, if someone like China invaded the US. You’d like to think that you would defend yourself against the invaders.Most likely, though, being as many of the people in the US are domesticated and trained to worship “might”; I doubt that most people would do anything if invaded.