Innocent people in the thousands die every day to car accidents, famine, violent crime, etc. The US has killed an estimated 5,500 civilians since the start of the Iraq war. This is true for (all)most wars. A few innocent lives by capital punishment in order to maintain a strong system of justice and punishment is a fair price.

If you set the bar for the exception to every rule, then right becomes wrong and left becomes right. To condemn any system for a small percentage of problems is to deny reality.

And what about the molester priest who was killed in prison by a "lifer" in Massachusetts. You see, there is no ultimate price and thus this lifer only has to face additional years put onto his sentence. The molester priest was an "innocent." This is but one solid reason capital punishment should exist.