On one hand, I agree with this.
On the other, a significant portion of the people engaging in this behavior aren't doing so because they're making rational independent choices, but because of a deep seeded lack of self esteem perpetuated by a white culture that sees lighter skin as more beautiful and darker or black skin as bad or ugly.
I still think it should be allowed, mind you. I just see how it perpetuates Eurocentric standards of beauty. I'd look for ways to move culture away from a Eurocentric standard of beauty generally rather than target this behavior specifically.
No exactly. There are poems in Chinese literature expressing the idea of lighter equals beauty/handsome, more than two thousand years ago, when Chinese didn't know any other skin color existed.