How can radio continue to be so stupidly racist?

I know, I know, I'm painting all of the radio industry with an awful broad brush. But let's face it, no one's doing this kind of stuff on TV. A year and a half ago, I wrote my (embarrassingly, most recent) Nikkei View column about Hot 97, a station in NYC, which broadcast a tasteless and racist satire making fun of dead Asians after the tsunami. But similar incidents continue, even up to this month.