Read the questions on it. It is not simply to do what you describe. If it were, they wouldn't be asking me to classify myself as one or the other when I'm 50% Spanish. If they only wanted to know minority/majority, they wouldn't be asking what my mortgage payment is or how many toilets I have on the same questionnaire as the one where they ask ethnicity.
They try to justify each question here
http://www.census.gov/acs/www/...t.htm
but it still comes down to how the gov't can segregate and seperate people instead of just counting them all as human beings or American citizens. Whether I have a toilet or not should not be a factor of my ethnicity but it will continue to be as long as the government continues to promote it that way. Continue to seperate and segregate and people will continue to look at their ethnic group first because that's what their government is doing. As a country we need to get away from seeing every little thing in terms of skin color.
Plus, refusing to fill it out should not be punishable by federal law. If I want to give them that information, fine. But I shouldn't be FORCED to do it. It is an invasion of my privacy.