Why inmoral? Simple, the Constitution is based on the idea of equality of all, especially before the law. Our laws have almost always exressed that. And, there is no doublt that morality in the Western world is based on that.
In my blog posting named NYT Revealed True Cause of Fannie Mae Crisis -- In 1999! it acan be seen that the attempt to change standards to help American minorities buy homes started a process that is mostly responsible for the current financial cirisis.
One of the most important ways the government get it's racial and sexual data is from applicatins. Think about almost every aplication you fill out. There is almost always a section for you to put your sexual and racial id. The government then uses that track trends and discriminate against groups not as politically popular as others. For instance, you are judged differently on most college entrance applications if you are Hispanic or black versus white or Asian.
One easy way to stop this is if individuals would not put down their true sex and race. For instance, I normally put that I am a female who is half Filipino and half Eskimo. If we could get just 10 percent of the population to do that in the US we could make the racial statistics meaningless. And sooner or later the uselessness of the statistics would become apparent and courts or bureaucrats would stop the use of the statistics for dividing us.
One more thing, not filling out the sex and race on the form or application does no good. The receiver of the form is typically charged to fill it in themself with their best guess. However, if you fill it in the law typically does not anyone else to challenge it r change it.