What consenting adults do in their bedroom/private lives is none of my business. We must also consider that the very definition of incest varies among cultures. Cousin marriages are normal in some and abhorred in others for example. In some cultures marriage within the same tribe or clan maybe considered incest. Even here it sometimes depends on who is considered part of the tribe and who isn't. In other cultures it is a matter of caste and whether or not the culture is matrilineal or patrilineal. Often an uncle/niece or aunt/nephew relationship would be allowed (even encouraged) while the same is considered immoral in other cultures. Back in the 19th century UK was still fighting over whether it is incest for a man to marry his brother's widow or for a man to marry his deceased wife's sister.
Frankly I am not bothered as much by consenting adults engaging in incest as much as I am concerned about the offspring since inbreeding has a scientific link to increased frequency of congenital defects. This is of course a problem with heterosexual incest. The homosexual variety is quite free from this concern. I am not entirely sure if the psychological issues wouldn't be bad (for the child that is).
I don't like how incest is often punished by prison sentences. I mean there are far more serious crimes that deserve that kind of attention and money/resources than some harmless adults engaging in 'kinky' behaviour in their bedrooms.
I think the medical issues will eventually be solved and some day we will be able to detect and correct congenital issues during the pregnancy.
Well said. 👏 Frankly speaking, if incest does not cause harm (to anyone), then let's "live and let live". No one really cares what others does behind closed doors. 😉