Thank you for the answer, though I can see we will never agree.

I believe that defense of self and others (and most especially those who are unable to defend themselves) is a moral imperative that is even higher than, in your example, the right to vote. That being the case, the cost benefit analysis must be the same as for freedom of speech, religion, voting etc - all of which have some regulation but are seen as equally essential civil liberties. To be sure there are responsibilities that come with rights but the existence of those responsibilities and the potential costs of living within them does not make the right any the less essential.