I might hazard to direct some blame towards the armed services......
Leaving aside the question of whether it is the right decision to leave (I happen to think it is) , there is the question of how to organise that departure. Allowing for the fact that the timetable was to a large degree forced on the military, the planning and arrangements thereafter are down to them, and do seem to have significantly contributed to the unfolding tragedy we are witnessing. It was never going to be easy or painless, but the images of people falling off of an airborne C-17 surely eclipse the iconic Huey over the embassy roof in Saigon shots. Pictures do speak a thousand words, and those images say all there is to say about US attitudes and priorities when push comes to shove. Sorry to be so negative about a friend.