I have one particular GM who has this thing about dead dead NPC's
I have a bloodrager built for damage (as one does with a raging class)
On multiple occasions this GM has threatened me that if i kill an NPC in a fight i will be mark down as evil
He forces me and others to "deal non lethal damage" or not attack things that are not dead but "close to death (read still alive and fully able to kill MY party memebers)
Recommended we spend gold on "getting a mercy enchant so we can go nuts, but still be careful as negative double con can still kill someone"
On each occasion it was not him trying to nudge us to get that last prestige, just some random fights with random things.
On one occasion the NPC he "saved" was one that had 2 rounds prior took on of us to -10 HP but was "on his last leg" (not even staggered, but close to death)
And he always ends fights in such a way that he almost forces party resources to keep the dead npc's alive, be it real healing or at least a stabilize.
He is one of the higher up GM's in my are so i am not sure what to do.