You don’t need to assume that it isn’t a tragic familial background, either. Or any other sort of trauma which would push one to close off. Throwing the “soulless” label aroud willy-nilly is just an extension of abusing the “narcissist” moniker. It prohibits any nuance and facilitates unjustified suspicion.

Yes, there are sociopaths who can be considered soulless. But just because one is odd does not intrinsically mean one is soulless. There’s a plethora of other potential reasons.

Plus, don’t forget, oddity is in the eye of the beholder in the first place. My odd may be completely different than your odd.