We may certainly aim to live in a society in which nobody should be held back from what they can do because of some personal characteristic allotted to them by chance. If somebody has the competency to do something, and the desire to do something, then nothing about their race, sex or sexual orientation should hold them back. But minimizing difference is not the same as pretending difference does not exist. To assume that sex, sexuality and skin colour mean nothing would be ridiculous. But to assume that they mean everything will be fatal.
Now thats what i call argument. Why cant you write like this throughout the book?
