If individuals are being abused, they can be removed, and put with foster citizen units.

How does that work? People are permitted to kill members of their own citizen units without penalty. If they can be killed without penalty, surely they can be abused without penalty too, right?

Of course you could say "they can be killed but they can't be abused", but that leads to problems. Can someone threaten a member of the same citizen unit with death or does that count as abuse? How do you determine abuse anyway (if I am about to duplicate myself, and I arrange a precommitment which results in one copy being abused and one copy benefitting, can the abused copy appeal to the anti-abuse law, thus essentially making such precommitments impossible?)

Consider traditional societies where one's family is of large cultural importance.

Families are limited in what they can do to their members much more than members of CUs are limited. Furthermore, we consider some of the things those families were permitted do to be immoral nowadays (such as letting husbands abuse wives.)