The normal inclination would be to condemn him as a traitor but that is morally wrong. Walker is a POW in our war against terrorism. How many of the soldiers of our enemies have subsequently become US citizens I wonder? Were members of the Japanese or German military forbidden to immigrate here? Were they executed for killing Allied troops? No, they weren't. Perhaps Walker should get special treatment in that he should never be allowed to come to the US again. That would be a fitting punishment for renouncing his citizenship. That and regular beatings by Afghani women.