Wait! don't we already legislate morality?

If morality is a system of ideas of right and wrong conduct, then we, society, do indeed legislate morality. However, the question remains, "Whose morality should be legislated". Technically, morality is already legislated if murder, theft, and battery is illegal. I think people often get confused with what morality encompasses. Instead of saying morality can't be legislated, why don't we say "ethics" can't be legislated, for ethics are more of a set of beliefs for a certain group or sect. For example, Catholic ethics forbid abortion and euthanasia; therefore, instead we should say CATHOLIC ETHICS should not be legislated...