The moral world is as little exempt as the physical world from the law of ceaseless change, of perpetual flux.
You can't talk about the environment, you can't talk about political correctness, affirmative action and all the other innumerable things that freedom is about, unless you have a free society based upon the integrity of the individual. If you have a responsible society, these other issues will not come up in a responsible society, and that is what freedom is all about.