V2 was of questionable legitimate military utility too. Sure you can hit a target the size of a city, but unlike carpet bombing, the payload isn't enough to guarantee that something specific is destroyed. So you can only use it to randomly harm civilians and maybe every once in a while hit a military target. Compare this with the Western Allies' approach where they also killed and maimed tons of civilians but at least stood some chance of also destroying the building-sized thing they were aiming at, given the stupefying tonnage of bombs involved.
"Once the rockets go up, who cares where they come down? 'That's not my department,' says Werner Von Braun." -- Tom Lehrer https://www.youtube.com/watch?v=QEJ9HrZq7Ro