That new guy still seems like a d'bag. I'd be guarded against him just like Weaver. Dax seems to be acting like the type of person that doesn't at all comprehend the idea of "bad people" and might not get it until something really awful happens to him. Not that I think this guy could harm him (unless he has a gun), but that doesn't stop someone in the future from doing Dax ill. Which I think is a shame because I kind of like the big guy. Hard lessons.
Actually, I'm intrigued by this new guy. For the moment, I haven't seen anything that indicates that he's a bad person, despite the antipathy he seems to be gathering. I agree with Dax on this one, though I can see where Weaver is coming from. Let him speak and then decide whether he means ill or not!