Similarly...
I had a "prisoner" scenario in a gaming session as well (as DM). The group (CN half-orc Bbn, NG dwarf fighter, NG elf druid, NG elf wizard, N halfling rogue) had cleared out the mine, except for one area. Two pitiful, wretched, half-starved and half-dead kobolds were hiding in a corner, scared out of their minds by the skeletons. They immediately surrendered to the PCs, and promised to reveal everything they knew. The group tied up the kobolds, and dragged them around the mine (of course the kobolds were freaking out). The group interrogated the kobolds about any possible secret passages, and got information about a secret elevator. It was trapped, but the kobolds didn't know this.
The rogue searches it and finds a trap. The barbarian gets mad that the kobolds didn't tell them about the trap (bbn has int 9, not exactly stupid), as does the dwarf. They start roughing up the kobolds (who are still tied up, starving, and half-dead). The kobolds shriek "We didn't know! We tell everything!" And the barbarian lops the first kobold's head off. They start roughing up the next kobold, who is crying, whimpering, huddled on the floor. The dwarf CdGs it.
Now, the way they handled that, to me, was an evil act. There's no way the kobolds would know of the trap - it's not like they run the place. Even though the bbn acted in character by getting angry, killing them *because they didn't know* was over the line, as far as i was concerned. The second kobold was huddled on the floor, almost licking their boots, and they still execute it? *Especially* a NG character?
The two elves were horrified. (Considering it was their first time playing D&D, I could completely understand).
We all ended up in an argument, them trying to convince me that what they did was good because they killed off evil monsters, me trying to convince them that torture and summary execution while pleading for mercy is not a good act.
I'm still split on the issue, though, meaning I'd like validation of my opinion

What do you people think of their act?