I am trying very, very hard to understand just what was going on inside his head.
I once read somewhere that until the mid-20th century, lots of people viewed cats as vermin. They saw cats as being just like rats, except only larger with fluffier tails. Maybe Adam was raised in an "old-skool" household like this? Maybe his parents taught him that cats were just low, dumb creatures? Maybe he never had a pet and hence, can't relate to people who love cats? Maybe he honestly thought that killing a cat is like swatting a fly? Maybe his thought process went something like "Oh darn, what's that noise? Sounds like that stupid cat! Ah nuts, I might have squashed the thing. Should I stop? Nah, it's late and I'm so tired, I've got to get up super-early for work tomorrow. If it is the cat, she'll just go mental on me, and there'll be a huge scene. I'll be stuck here for ages. Too bad if it was the cat, but hey, she can always get another one."
Hmm. Nope. Try as I might, I just can't give him the benefit of the doubt. Kick him to the kerb!