[MoosePlissken]

Drones may cheapen war in the way that you describe, but that still doesn't negate the fact that they kill less innocent people than the weapons and tactics that we used to use.

You seem to argue that the expense of a war can act as a deterrent. And yet, history is filled with bloodbaths that have failed to bring an end to war as we know it. Vietnam was horrific but it didn't keep us out of Iraq. I don't think getting rid of drones and forcing people to fight mano-a-mano will help prevent war. Deterrence only seems to work when the costs are astronomically high (e.g. nuclear weapons).