People feel strongly about many different issues, and they may be emotional and quite demonstrative about them, as well. For example, in the previous example of a woman's right to choose, the two sides are polar opposites and extremely emotional and sure that their decision is the right one. An "anti-choice" person may be highly prejudiced against a woman who has an abortion, but also against the doctors and nurses who perform the procedure. People cannot help being prejudiced; it is a part of human nature. Even the most devout and "Christian" are often prejudiced against other religions, believing they are the only ones who will go to Heaven and find their reward for life on earth. Prejudice usually conjures up visions of race relations and a misunderstanding of cultures, but prejudice is really intolerance of any one or anything, and so, everyone is intolerant of something, whether it is immigrants or telemarketers, and so, moral values are subjective, because everyone has a prejudice about something that can color their moral values. In conclusion,...

Moral values are a big blend of the things we learn when we are young, but they also change as we mature and learn more about ourselves and others. The same moral values that guided us as children may no longer be valid in our lives, and so, we change them to fit our needs. Another philosopher notes, "Your moral values are your beliefs about what is important in life," and as we grow and change, those beliefs change with us. Thus, moral values cannot be objective and balanced, because they change, grow, and alter as our life alters. We may become more tolerant as we grow older, or we may become more strict and demanding. All of this affects our moral values, and our lives.
References

Editor. "Moral Values." AllAboutPhilosophy.org. 2008. 23 Feb. 2008. http://www.allaboutphilosophy.org/moral-values-faq.htm

Ursury, Danny. "Exploring Values, Rules and Principles." St. Edward's University. 2002. 23 Feb. 2008. http://www.stedwards.edu/ursery/values.htm