The authorities arrest a talking animal of outward human form that's worked to murder babies by using babies to carry the bombs. There's no chance of dishonor in peeling that onion and getting every layer of information out of it before discarding it.
Not the least bit.
Failing to get all the color out of the mine and thereby failing to prevent an attack on some more babies, merely for some pathetic misguided regard for that animal's outward human form? That's as dishonorable as it gets.