i wonder how come they're not psychologycally trained(brainwashed) to be immune to this. after 1-3 months of constantly telling them how cruel the terrorists ar

i wonder how come they're not psychologycally trained(brainwashed) to be immune to this. after 1-3 months of constantly telling them how cruel the terrorists are, showing them images of the attrocities that their future targets perform, i believe the operators will begin to feel like heroes for taking them out. I guess US is not that good at propaganda afterall