The issue with stories like yours is that they don't really tell us anything. The incidence of racial profiling is low enough that some people, such as yourself, will never have a problem, ever. But that doesn't mean there aren't problems, and that they don't crop up often enough to be something we should be really uncomfortable with letting happen.

In my experience, the airports could handle the passenger volume, but they lack the people. I've entered the US 25–30 times, and almost every time, there have been long lines and empty immigration counters.