"We" as in whom? Christians are always in the minority, and we don't make the laws. In fact Christians are to submit to the authorities that are above us, whatever those authorities may be. In Paul's day it was the government of Nero. Paul never complained or said anything against the governmental form of execution. He knew his fate. He was about to be beheaded for his faith. "I know that my departure is at hand," he said. "No one stood with me," at my last trial, he testified. He knew what lied ahead, and yet never said anything against capital punishment.
We are to submit to the government we have--we deserve. God, for the most part--gives us the government that we deserve. We are commanded to submit to it--whether that means captial punishment or not. Personally, I believe that capital punishment is Biblical, and that the principal set forth in Gen.9:6 has never been rescinded.
Genesis 9:6 Whoever sheds man's blood, by man will his blood be shed, for in the image of God made he man.