I gather your kids don't go to school east of city line avenue. If you go to a public school on the Main Line, where the black student population is no more than 10-20% and most blacks are as wealthy as the whites, I can believe you.
I live in Philly proper. My son went to the same high school I graduated from which in 1972 was 95% white, now it's about 40% white. Most of the trouble in the schools here are black on black, asian on asian, etc. It's mostly gang related.
Your comment reminds me of that old MFSB song,Clean Up the Ghetto.
"All you brothers on the Main Line
You lived in the ghetto once upon a time"