I agree that this is probably not the best example. The scrub one is better.

I think that "moral" is similar to "reasonable" in that it is based on intutition rather than argument and rationality. People have seen slavery as being "moral" in the past. Some of the reasons for this is false beliefs like that it's natural that some people are slaves, that slaves are inferior beings and that slavery is good for slaves,

I guess I was thinking about it from two points of view:

• Is it rational to have the moral belief that there should be slaves. A rational person would look at all the supporting beliefs and see if they are themselves rational. For example, are slaves inferior beings. The answer, as we know, is no. In terms of the mass slavery of large portions of people, this has often been due to some characteristic like high levels of melanin for the slaves in America. These characteristics don't make people inferior and they sure don't make people inhuman.
• With the system set up the way it was, was the alternative to slaves inferior? I am not an expert on this, but I was thinking that the alternative was not inferior. Perhaps, it would have been slower in terms of growth, but America still could have thrived as a nation if the south abolished slavery without war.