Spend ten minutes perusing education blogs and you will find some experienced PreK debaters defending charter schools:
A: Charter schools cherry-pick their students.
B: DO NOT!
A: (presents some data)
B: YOU JUST HATE CHILDREN! AND SUCCESS!
A: (presents some more data)
B: (covers eyes, sings "Mary Had a Little Lamb" at top-volume)
This Reuters report seems pretty definitive, but then, so is the Nursery Rhyme White Noise Strategy.