My son made something that is horrific how should i punish him?

he made a music video dedicated to the marines he is 14 and wants to join he made it with horrific pictures and video of war and dead terrorists and he even had a video of an iraqi being shot dead in iraq and he emailed it to me and i do not know if i should punish him or not and if i would punish him how should i do it cause this is one of those things were taking away the xbox or the computer will not work