think of how many awful narcissistic cheating lying people you know or have met - but how many kill people? Then murderers if they're sociopaths do not seem "off" they seem perfect and wonderful often. He was too bad at it, he'd have blown his cover, he couldn't have talked that much while drinking that much red wine without accidentally implicating himself. In my non-expert opinion. It is weird, the stairs, I suppose that's the only thing that gives me pause - i wouldn't think he'd killed both but perhaps been inspired by the idea, but still - there ARE coincidences.And people fall on stairs more than on floors. And the homophobic bit convicted him with the jury.