Really hard to categorize here. I see where you're coming from, when you can't empathize with any wrong doing in any form whatsoever, but really, at the bottom of it, but on a humane level, every individual has seen and developed a unique perspective of life, growing up. Whether its a scammer or a petty thief.
Some are left permanently scarred and absolutely have no idea of the consequences or bearing it can have on their 'victim'. There's just so much deep rooted hate, anger, anxiety etc. It's really very hard to say how they tick. Like, for example, what do you think the mental make up of a murderer or rapist is?? It's a mind that's so fucked up, that there isn't much scope for rational understanding when viewed by a more healthy mind.