You can take her to the gas chamber or you go to the gas chamber yourself and someone else can take her in.
I mean how many five year old girls did Paul Tibbets incinerate just obeying orders?
This isn't intended as a whataboutism, it's to say what do we expect people to do? You either convince yourself your cause is just and/or the alternative is a firing squad.
There's the apocryphal story of Khrushchev denouncing Stalin when someone in the audience calls out to ask why he said none of these things at the time. Khrushchev demands to know who said it, and the room falls silent in terror.
"That's why".
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