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some arguments for legalization were:
- disability can have many causes, e.g. when one/both parent(s) in a non-incestuous relationship are disabled themselves, the children are very likely to be disabled. However, disabled ppl are, of course, allowed to marry and have children
- the incidence of incest is very low because normally children who grow up together (even if they are adopted and not genetically related at all) develop a psychological incest taboo, i.e. they will see the other children as their siblings and out of bounds sexually, even when they are NOT related. So legalizing incest would not result in a lot of ppl suddenly getting interested in it and practicing it.
They are not good enough.
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- Sleepy's own argument: why should one of the partners be more vulnerable and weaker than the other, as long as they are both of age and have all their faculties intact? In this particular case, the woman (sister) was more vulnerable because she was mentally handicapped, plus the man (brother) beat her. But this isn't always the case, so how can you tell which partner needs to be protected? Plus, there can be a "weaker" partner (battered wife or husband) in any relationship and yet ppl are not generally prevented from marrying. You can only define who is the weaker partner after abuse has taken place, not before ppl marry ???
When you put everything to consent - then anything possible.