You're right, it makes no sense at all, but that's how some laws are made. I guess it is there to appease the people who view an albino deer as an extraordinary specimen. We also have at least 1 city in Illinois that has albino squirrels. You can get fined if you hit one with your car!
Does anyone remember the native americans view of a white buffalo (bison)? They view it as religious symbol and will travel great distances to view one. It was just a few years ago that one was born in Minnesota are one of those northern states and native americans came from hundreds of miles away to worship it.