As usual, Mr Giles has scaled the heights of stupidity. Didn't most of us send our children to public school? I did. Then I sent them to good colleges and then they got high paying jobs as professionals. I don't see how they could have done much better had I sent them to the most expensive private schools in the country.
Parental oversight is key no matter what school you send your kids too. Help them with their homework every night, help them with special projects, help them prepare for their SATs. If you stay involved in every part of their education, public schools will do just fine.