But, I think cops are human too and they're just as prone to racist thoughts as anyone else. Ong wants to use the 'few bad apples' argument about racist cops here, but I think it's just a job that attracts some pretty dodgy characters as well as some very good ones.

I don't disagree with this. It takes a certain kind of person to be a cop. And yes, some of these people will be racist. But it's really difficult to act upon that racism, because it is frowned upon socially and against the law.