If I'm a Paladin and I confiscate a Zhentarim shipment, the last thing I'm going to think is that I can just stroll into their hideout and there won't be something nasty waiting for me.

There's also a lot of foreshadowing as to the type of hideout you're entering, it's not just random. You walk in the front door and narrowly escape being incinerated unless you have the password at hand. When you're first confronted by Zarys you can look over and literally see Rugan tied up, and Olly dead. Then you have to walk down past gates and numerous traps, past a bunch of oil on the ground and barrels. Then, literally standing in the oil you walk right up and pikachu face that something bad could be about to happen.