I do entirely understand the idea that functionality that can be used against users (even if it can also be used to enhance user security) is bad, I just don't understand why people will simultaneously make that argument and support the idea that a software license that says "You may not use this software to murder people" is incompatible with the ideals of free software

@mjg59 The problem is the interpretation: "We are not killing people, we are eliminating terrorists!", "We are executing a death penalty lawfully declared by a jury", and so on. The interpretation becomes even more troublesome if you replace that sentence with "You may not use this software to oppress people".

@mardy The one I've considered here is something like "You may not use this software in any way that would impair any other individual's inability to exercise the freedoms granted by the license", on the basis that if you kill them that's a pretty clear impairment of those freedoms