Killing people who have killed people makes about as much sense as the rest of the government's nonsense.
People talk against the Constitution, against the "right to bear arms" portion, and say that the document is old and out of date and didn't take into account modern times...
The same people who applaud the death penalty seem to forget the "eye for an eye" doctrine predates the Constitution by about 4,000 years...
So... when is a document too old to be of worth?