Civil Liberties...should we limit what other people can do?

It is taught in schools, albeit only in advanced level philosophy and ethics, as far as I am aware. I agree that it should be made more popular, since it is a logical form of morality which requires no inherent and unfounded duties, as in religious morality which is deontological ('this is good because God says so/ this is bad because God says so'). People need a logical basis for morality instead of assuming that morality requires faith in established duties. Recognition of other people's suffering is an ability almost unique to humans; it is not an ability we should neglect, or we will be no different from any other beasts.

Exactly. Even if people have vastly differing morals, you can't ignore the common trends and how many of the things that are seen as immoral in backwards cultures are based on illogical beliefs.

It is possible to form objective morals using logic.

Bravo. It may be that opinions can't be right or wrong, but they can be rational or irrational, logical or illogical, consistent or inconsistent.