I get that the Death Eaters were sending a message, but using both Fiendfyre
and severing charms is going overboard, wouldn't you think? Oh wait... guess that's the real issue, rationality and thinking must not be their strong suit...
Fear, pain, and suffering are their idea of tactics, but last I checked those things stopped working when the ones using them overstepped and made it so that the ones they were attempting to hold down were left with nothing else to lose. Animals fight harder when backed into corners, and in a way we're all just animals when it comes down to it, right?
And yeah, I get that my sentiments might be putting a target on my back, but I'm certain one was there anyway even if I didn't see it.