Personally, I am curious as to why they don't want white people in. Limiting your numbers isn't something to do if you want to spread your influence (not unless you have no qualms with using violence to spread it or have unfortunately come to violence), but, at the same time, you don't want outsiders to take over either. Maybe they've had more problems with whites supporting them than it's been worth? Perhaps it's paranoia or reasonable suspicion that has them keeping white people out? Like it or not, white people, as a whole, do not know oppression and racial stereotyping like racial minorities know.