Take a few studies and a psychologist will advance strong arguments on the thin foundation of a few studies. There is no doubt that the visceral reaction of disgust is linked to thoughts of moral abstraction, though that linkage is, at present, complex and obscured.
Some studies prefer to extrapolate a simple principle based upon their speculation: to wit, all morality is based upon the evolved response of disgust. This makes for some strange notions:
If the evolutionary story about the moral emotions is correct, then
human beings, by being a less social species or even having a
significantly different prehistoric diet, might have ended up today with
an entirely different set of religions and ethical codes. Or we might
never have evolved the concept of morals at all.
Relince upon evolution for the narrative does lead to a bias in favour of simplicity over plasticity. Still, if disgust is the distant ancestor of cant, then we should be prepared to wrinkle our noses, look askance and pretend that we want to throw up when presented with some new turd dropped out of the state.