Despite not having intervened previously, you feel a need to right the injustice of Laine's terrible, terrible humor. You deliver a mild whack to the back of Laine's head. "How can you joke about people who were murdered?" you say. Laine seems unfazed. "I'm not taking any guff from you, rookie," he says, not even bothering to look at you. "If you want to help here, go talk to the hobos over there. If you don't, I suggest you go mind your own business."
Talk to the hobos. Look around for clues on your own. You shouldn't have to deal with these people to get things solved. Decide that you in fact will mind your own business. In short, leave Westfall.