Stealing also happens between same faction players as well. I also play Neverwinter and the objectives for quests are ALWAYS active, regardless of whether someone clicked it just before you. It only goes inactive for you once you clicked it. Only downside is it will no longer respawn (for you, stops camping at one node I guess) ), but there is usually plenty of nodes around to finish the quest. So stealing objectives is pretty much non-existent. Perhaps the devs could look into emulating something similar in TOR to solve the problem.