Disturbia

So my Junior theme topic is suburbia, mostly planned communities, and the social issues surrounding it, but I've had a really tough time coming up with a thesis. I'd really like to address isolation, race, and safety, but I can't prove that everyone who lives in planned community is a racist or an isolationist, nor would I want to label them as this. However, I do know that a lot of planned communities were built for isolation of mainstream culture and safety, but I can't prove that the people in it to this day follow or support these issues. What's really frusturating is that I can't come up with a thesis so I can start my paper. I guess what I'm saying is that I need to narrow my thesis to the builders of these communities, find proof that everyone living in these communuties is crazy, or change my thesis completely. Help?