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It's a social contract where we all agree that in return for making something, we'll give you a bit of say in what happens to your work.
For most people there is absolutely no benefit received from work that is already completed and sold. If as an electrician I design and wire someone's electrical system I get paid once, there are no future payments if the house is sold or if guests come use the system I installed.
The people who allegedly did the 9-11 attacks had brown skin and are rather indistinguishable from the brown-skinned people south of the U.S border.
Are you really suggesting that you can't tell the difference between someone from Central America and someone from the Middle East?
"Pay no attention to the man behind the curtain." -- The Wizard Of Oz