I believe, for reasons that have been precisely stated in this thread, that capital punishment is Biblical. There's no doubt about it in my mind, and I would not oppose it, except in cases of mistaken guilt which were glaringly egregious. In principle, I would never oppose it.

However, in my country, the criminal justice system is a monstosity and an abortion of "justice." Innocent men are imprisoned (and, presumably, executed, although rarely), while malefactors run free. I have nothing but contempt for the United States Department of Justice, whether administered by Democrats or Republicans. A Republican administration gave us Ruby Ridge; a Democratic administration gave us Waco and Elian Gonzalez. But that's getting a bit far afield....

The bottom line is Romans 13. If the early Christians could submit to Nero, I can submit to Bush and Obama. And that includes accepting the Biblical principle of capital punishment, even when imperfectly administered.