A: How should we get famous (so I can find my friends)?
D: Bait some greedy thieves into our den, then kill them all to show how strong we are.
A: Hmm, I don't usually like killing people, but whatever.
A: Why are you guys doing this?
T: For money.
A: So you have been offered enough money to put your life on the line?
T: Yep.
A: I see, so it's your choice.
It's not Ainz's problem that these guys got their risk assessment wrong. In fact, what risk assessment? These guys had no clue and just went in.
This is hardly "full on evil".