Yes. In the same way that the eradication of poverty and inequity could be considered right. These issues are not a result of subjectivism but the social and political environment in which these situations arose. Similar to the problems with the value judgements you mentioned is the way in which these views at the time were seen to be grounded in objectivity - the belief in the existence of objective morality can be just as, if not more, destructive when compared with subjective morality.

Whence are the objective standards of morality you are referring to? There is no objective principle of morality, to improvise one for the sake of objective morality would create many more problems than any subjective valuation.