well thats what i mean. And thats why is taboo. If everyone thinks there is no risk then there is no limits on people actions or restraints. Inbreeding risk presents usually when there is about 4 generation on inbreeding. And actually its not main factor. Main factor is genetic diseases. and when in family there is genetic disease then inbreeding will have risk to carry it on. But in taboo sense it doesn't matter thats why taboo was created to stop inbreeding. But now as we like in 21 century then its just sexual act without need to procreate and tools to stop it. But its still considered taboo.
If we check historical royal and noble lines they are all heavily inbreeded, but that dosent mean they are all sickly or genetic foulness. There is a difference in limitless inbreeding and selective breeding and in human world there is same rules as in the animal world. you can inbreed but you got to know limits and be sure genetic diseases are not carried on.
