Why conservatives should be against the death penalty (but they aren't)

The perverse Jodi Arias jury, deadlocked now and can't decide whether she lives or dies.  Lost track of how many days they've been deliberating her fate, there's been a devastating supercell tornado in an Oklahoma suburb and the blanket media coverage of the aftermath days after and they STILL haven't arrived at a decision.  I was pondering all this on my walk today and I think it's a fair guess to say most conservatives these days like to be known as libertarian to varying degrees, to different shades and their animating principle is of course they're against increasing the Power of the State and don't even like the power it already has.  The State however has the power and authority to imprison you, that's a major power but they also in some cases, in many cases have the power to also put a person to death.  That's an awesome power, a disturbing power.  For me my personal opposition to the death penalty has nothing to do with sympathy for the criminal in most cases but more a disturbing sense of the Power of the State, it bothers and nags for some reason.  Dunno what the official libertarian position on capital punishment is, I mean I know their position on that other kind of capital punishment (ka-ching ka-ching) that Obama represents but where they come down on putting a criminal to death I really don't know or haven't gotten the memo yet.  Yeah you'll say but it's in the Constitution and that's true but I've been wondering too of late should the Constitution be the be-all and the end-all? our Bible especially when it kinda contradicts libertarian tenets at times and while we all revere the wisdom of the Founding Fathers but being human and all and not the demigods we make them out to be they could've been assholes on occasion (see eminent domain).  Yeah I haven't talked about the death penalty all that much here down through the years primarily because people's minds are mostly made up and what's the point but have finally crystallized at least why it bothers me so much.  IMHO it should also bother your average conservative.  Maybe Rand Paul can tweet it:)