You don't have to kill someone in line of sight with it to argue that a technology is a vital military asset. Nor has it to be its sole purpose.

PS: Obligatory Enigma reference: https://en.wikipedia.org/wiki/Ultra

PPS: I'm not saying encryption should regulated by the government.

How many people were killed by a CAD file?

And neither has a plastic gun.

it saved lives probably, can't have that, verboten.