In Bracada some golems object to a dark party, but nobody objects to killing them, not even the other golems . In Tularean I haven't found anybody who cares what path you choose, except the trees but by that time they are already dead anyway. Some people in Erathia objects to one of the dark quests, but as soon as you pay the fines and leave the map they forget about it.

You do miss some fun by only playing the light path.