I’m a minority who, despite visually fitting the stereotype of a plane hijacker, have found our passport control people to be nothing but professional and courteous. The overall system seems to be pretty efficient about moving people through, despite the airports I’m going through being out of date and not set up for the volumes of traffic they get.
This is a marked contrast to the rest of our immigration, border patrol, and airline security people who are lazy and needlessly aggro as a rule.
But if you asked me to trade the passport check experience of entering the US with the experiences I’ve had trying to get into France or Germany I’d pick the US hands down. Especially Frankfurt. WTF are they doing over there?
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.