Eat_Up_Martha
Prince
People also have a natural biological resistance to breeding with closely related members of the family; reverse sexual imprinting is a natural safeguard against genetic stagnation. I'd imagine that the moral aspects of the argument come from some sort of sympathetic response to seeing incest practiced by others. That is, we would not sleep with our siblings and so are disgusted when others do.
Also, bruncles and flipperkids aren't good for anybody. Even though, iirc, the actually deleterious effects of inbreeding take generations to manifest, if at all.
More to the OP though, I'd argue that it's a matter of choice. Limiting someone's ability to breed at all is tantamount to forced sterilization. Hell, sterilization may be the preferred method if it came down to actually enforcing something so ridiculous.
Also, bruncles and flipperkids aren't good for anybody. Even though, iirc, the actually deleterious effects of inbreeding take generations to manifest, if at all.
More to the OP though, I'd argue that it's a matter of choice. Limiting someone's ability to breed at all is tantamount to forced sterilization. Hell, sterilization may be the preferred method if it came down to actually enforcing something so ridiculous.