According to my napkin math it would cost 1.5 trillion USD to kill every American with drones and I am already assuming very cheap and capable ones, that you deploy them near the target and that the target is incapable of defending itself. The cost of deployment itself isn't even included. Nuclear weapons are very cheap in comparison.
Let's put that number in context. USD 1.5T is 2/3 (or 3/4) of the total cost US spent on their forever war in Afghanistan.[0,1]
Clearly doable for a dedicated nation, given that US lost the war, lost the 20 years, and with their botched withdrawal handed the country back to the very same political power they wanted to drive out in the first place.
In comparison, spending less than the cost of a lost war and having a guaranteed result of being able to walk into an empty territory sounds like a bargain.
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