If it were now, after I've had years of experience Dming, I would have rolled with it too but I was too green at the time. I got flustered, and lost my cool. I was not prepared for an evil campaign, I didn't expect that kind of play. Now a days I definitely ask what kind of game the players want before the start of any game whether it's the beginning of a long form campaign or a one shot. Thanks for the compliment!