KarinsDad said:
So, hindsight being 20/20, yes he did not have to do that. But, it was one of those situations where he spontaneously did it before the rest of the group could do anything (he is CG). And, the fact remained that the module was set up with such a creature. Even dummied down like it was, it was still too much of a threat for a first level group.
The particular module may have it's design flaws. Not having seen it I can't say.
If you put a big nasty in a module you have a responsibility to give clear clues to it's presense so the PCs with their heads on straight know to treat it with proper caution.
Not having seen this module I can't say weather I'd agree it did that or not. There are a lot of badly made modules out there after all.
So until and if I do see the module please take my critisms as for the general case I'm trying to illustrate rather than your specific one.
One thing I will say from my military experience's coloring my view of life is that every member of a team has a responsiblity for the actions of every other member.
A member who cannot be trusted needs to be pushed out.
Stupid behaivoir != chaotic behaivoir. Nor does chaotic mean a lack of caution.
If you have a person who can't follow discipline then you need to either remove them or remove their ability to be responsibile for any actions (in other words; police their actions).
My current PC; a minor noble and former bandit, would probably order the group to hang the ranger and expect the command to be carried out.

But then she believes very strongly in discipline. She's got an uncomfortable amount in common with my own view in these kinds of situations (more like me than most of my PCs, but I hear it's impossible to truely escape yourself in character design).
In a feudal like society or a military unit; even a chaotic will know to control their actions somewhat. There are just as many chaotics in the military as there are lawfuls; but discipline still doesn't break down when there's proper training.
And adventuring bands are quite often very much small independant military units in a feudal society.
The ones with the freebooting wild bent to them very rarely live long and certainly don't deserve to survive.
This kind of ties into another rant I've been considering about how PCs behaive towards the concept of a caste system (nobles, commoners, etc...).