Beheadings v. Drone Strikes

We all are horrified by the beheadings which have been occurring in the Levant.

However, I'd like to know why we're not as upset when it comes to US drone strikes.

Do we not realize that the thermobaric warheads (e.g., Hellfire missiles) fired by those drones tear to pieces and incinerate the bodies of their targets?

ISIS commits their barbarous murders up close and personal and in the open, while America commits their barbarous murders by remote control from air conditioned trailers and more or less hides the results.

Shouldn't decent people be condemning both sets of killers?

Update: Retired FBI Agent Coleen Rowley has written an enlightening essay on this subject:

http://www.opednews.com/articles/Beheadings-v-Drone-Assass-by-Coleen-Rowley-Assassination_Beheadings_Drone_Polls-140930-666.html