Unfortunately, Light Side simply does not have the benefit of being able to do anything they can, even with simple NPCs. Even something like killing bunnies to improve fury likelihood is frowned upon by the more stickler folks. And you never really know when a stickler is watching.
The idea here is that light side is gifted with many things to make up for the narrower road they walk. Included are light-only items, the alignment-based bonus (unless darkies also get this?), and the rewarding knowledge that you treated an NPC in a friendly, appropriate manner at the expense of getting its loot.
There's a reason the FAQ does not recommend going lightie right off the bat.
That reason is that lighties aren't allowed to play the game fully.
Edit: 
