While we're at it, do we really need any of our constitutional rights?
I'm not really sure where you are going with this line of reasoning, but I'll play along.
Either a) You are pointing out that the constitution is our protection from government intervention. Therefore a chipping away of one right will lead to others. I would counter with "living document," etc., etc..
Perhaps b) The second Amendment helps guarantee the rest of our rights? I would counter that a gun never guaranteed anyone any more "rights" as I have seen in Africa and other countries. Nor if the government was stripping rights away would you gun prevail against its military.
Or c) I have totally missed where you're going and hopefully you tell me