Well, yes... I have a niece whose reaction to discovering she's caused someone physical discomfort is to laugh, and I'd be lying if said it didn't disturb the heck out of me.
But I've seen other children pass through such things, and emotional/social development doesn't tend to be a nice linear curve designed to make everyone comfortable. I'd hesitate to seriously consider even an amateur diagnosis of something like "sociopathy" until someone is into puberty unless such disturbing incidents occur on a daily basis and the child seems to revel in antisocial behavior. And that's actually very rare.
But I've seen other children pass through such things, and emotional/social development doesn't tend to be a nice linear curve designed to make everyone comfortable. I'd hesitate to seriously consider even an amateur diagnosis of something like "sociopathy" until someone is into puberty unless such disturbing incidents occur on a daily basis and the child seems to revel in antisocial behavior. And that's actually very rare.