Guys it's real simple why no African Americans should claim biracials as black, and I will dead the debate. In order to understand the rule, you must understand that whites created it and that's why it doesn't make any sense for any self-respecting black person to follow it. It follows the rule of hypodescent and is meant to keep the white race as pure as possible, that's why you had such terms as invisible blackness. here is a great analogy:
A barrel of fine wine sits in the same room as a barrel of raw sewage. Put a drop of the wine into the barrel of sewage and you still have a barrel of fine wine and a barrel of raw sewage.
However, put a drop of the sewage into the fine wine, and all of a sudden, you have two barrels of raw sewage.
So by following the one drop rule you accept that whiteness is pure and blackness isn't. Purity is good, clean and while impurity is filthy and bad. Keep relegating your tribe into a trash bag and following white supremacist logic and see how far you succeed.
A barrel of fine wine sits in the same room as a barrel of raw sewage. Put a drop of the wine into the barrel of sewage and you still have a barrel of fine wine and a barrel of raw sewage.
However, put a drop of the sewage into the fine wine, and all of a sudden, you have two barrels of raw sewage.
So by following the one drop rule you accept that whiteness is pure and blackness isn't. Purity is good, clean and while impurity is filthy and bad. Keep relegating your tribe into a trash bag and following white supremacist logic and see how far you succeed.