OK fifi,
I will admit that one of Terry's points seems to be self-contradictory.
The mongoloid children in the same class as the "normies" leads to less opportunity for the normies. As Terry says, "Consequently, those parents who can afford to--put the advanced students in special magnet schools where they can achieve at their own pace."
To my mind, that seems to be the logical and desirable result of that situation. As Terry says, we live in a world of winners and losers, the successful and unsuccessful. The cream rises to the top, does it not?
So when you have enjoyed success as the result of your efforts, and you don't want your intelligent child drug down by mongoloids, you exercise the power gained by your success and spend the extra money to obtain a better education for your progeny.
The public school system provides FREE education. If you don't like the education provided, you are welcome to purchase the alternate education of your preference. If you cannot afford this, you will have to make do with whatever quality of FREE education your more successful contemporaries are financing for you.