Actually minorities are known to distrust LE more so than anyone else. That's why JB wants them. No other reason. Good LE and investigation in this case, no other way to discredit them. I guess I watch too many true crime cases.
He was really hoping for a Hispanic presence, thinking they would empathize with him in some way. He has been thwarted though, each one screened so far has not been fluent in English.