The thing is, there are excellent reasons for the current interpretation based on precedent. Although I'm quite liberal, I partly agree with conservative legal scholars that the Warren court engaged in quite a bit of legal overreach during the 60s with cases like Griswold, interpreting the Constitution so broadly that legal argument ever since has involved too much rhetorical trickery and too little straightforward explanation of the Constitution. We spend too much time on increasingly strained arguments about what the language of the Constitution means, which would be better spent on building a public consensus to amend the Constitution using clear and unambiguous language, eg inserting an explicit constitutional right to individual privacy rather than 'discovering' one in the 'penumbras' (shadows) and 'emanations' of other constitutional protections like the due process clause of the 14th Amendment.

Of course the problem with rewriting the Constitution every time you have an idea for improving it is that after a while you end up with the sort of Constitution we have in California, which is less a collection of guiding principles than a heap of legislation on steroids: http://www.leginfo.ca.gov/const-toc.html

At bottom, what you have is a set of conflicting imperatives. It's perfectly reasonable to charge government with the job of protecting people from military attacks, and as we saw in 2001 the costs of failure to do so can be truly severe. The opportunity costs of investing the government with broad powers to prevent such attacks are much harder to quantify. I have to say that I think the 'war on drugs' has been legally and practically far more destructive of liberty than the Patriot act or the NSA (but please don't interpret this as an endorsement of the latter). I don't worry about top-down totalitarian government nearly as much as I do about the inexorable economics of privately run prisons and city and county pension gaps. People don't care as much about the liberty of crack- and meth-heads (since drug addicts stereotypically have little consideration for others), so we craft these overbroad laws intended to protect the legitimate interests of good people by scapegoating ne'er-do-wells.