War has been about wholesale killing, at greater and greater removes (the greatest being between the leaders and the front line) for a long time.
Carpet bombs aren't THAT different from chem weapons at the end of the day. Everybody inside of the area of effect dies.
And I understand that a fuel air bomb kills some by sucking the air out of their lungs, THEN they're vaporized.
I still think its more about upstarts being able to kill scads of a much richer opponents troops for a fraction of what "legal" ordnance costs.