see. Well, that was a bug, and you were supposed to be able to do the quest either way. There's even a journal entry for persuading her to give you the info, but it doesn't work.
Ah yes, and I'm fairly forgiving of bugs. Temple of Elemental Evil is testament to that.
But!
It would seem that
nobody at Bethesda bothered to test one branch of a binary choice. That's just poor QA. A QA tester should be going against the grain, and ruffling feathers. do the things that aren't obvious. In short, break the game, replicate, report, repeat. The fact that nobody thought to try out the "less obvious" (read: clearly wrong) choice implies an attitude of progression without RP consideration. You'd think there would be even just one person who wants to complete a quest without a bold faced lie. Of course, if that person did exist, they'd probably have balked at Dark Underlord's pet example, too.
Aside from issues with developer attitudes, I can actually understand why nobody picked the truthful choice. It's obviously wrong, in terms of advancing the quest. In fact, it
should dry up Addhiranirr as a source of information altogether.
I certainly wouldn't be telling secrets to somebody I'd asked to help me with the law, only to be sold out by them instead. And that's assuming the law didn't actually do anything to them before I can head back and give them the good news that I've sold them out.
So really, it's a stupid choice, given the scope of the consequences. As I said before, the only thing to be gained from it is the self-satisfaction that you stayed in character, when really, it would have been far more appropriate to give the honest character an alternate way to gather the required information.
And that could have been simple. You go there, tell Addhiranirr that you've sold him out, he gets angry enough to attack you (why wouldn't he?) and you find the info, or some lesser facsimile of it on his corpse. Hell, you could even let the player get away with 2/3 of the story, and let Caius intuit the rest while sitting around on a half-naked moontrip.
Anyway, it was a genuine attempt at a choice&consequence, and the only thing that made it fail was a bug.
So yes, it's not the bug part that irks me, although it would have if there wasn't a ready solution to found on the 'net, since it was a showstopper.
It's what that bug suggests, with regard to Bethesda's attitude and philosophies. It's a pointless, even idiotic choice included for no good reason. RP choices should be interesting, not crippling.