It is that players never can trust that the NPC's the DM puts before them could actually be beneficial. Although, this isn't my gaming group, my group would have beheaded them.
Perfect example: We are walking down the road and hear a rustle in the bushes. Instead of investigating in any way shape or form our ranger unloads a series of arrows into the bush. When it finally stops moving we investigate. Only to discover the arrow punctured body of a young girl, and more rustlings in the distance that we later learn are caused by a group of goblins that were chasing the poor girl till we mowed her down. whoops. She was supposed to help us get to the goblin lair or something. Instead the ranger ended up picking up a coin from her and it started haunting him, along with those few points of 'Evil' that crept up... lol...
So the group in the strip is actually pretty mellow
M.