All laws created by man are honest?

For centuries men created laws. Sumerians, Egyptians, Babylonians, Jews, Greeks, Romans etc. But the laws may not be correct. Especially those laws that represent interests of groups or that the conscience understands that are wrong. In other words, there are laws created by the men who are immoral. Morally incorrect. This happened with slavery. Currently, all countries condemn slavery. There are still laws immoral, they are: the death penalty, abortion etc. and those laws that represent the interests of economic groups which damage anyone.