The reactions to breaking the pact are so weird. In my game, Wyll had already gotten out of his first contract, and he was just waiting for the 6 months to be up. Selling his soul again makes him a tool for Mizora and ultimately Zariel. Mizora has already tried to trick him into killing an innocent person, Karlach. That's a completely pragmatic, non-selfish reasons why it's a terrible deal. But we can't point this out to the companions.
Their reactions are supportive if Shadowheart decides to kill her parents to escape pain. Why is that considered acceptable but avoiding eternal damnation isn't? At least Jaheira points out that any decent parent would never want want their child to take such a deal.
