I see the point but I would point out that homeless people in the USA aren't in general bound by any shared ethnic identity, geographic origin, culture, or body of languages that makes them an outgroup the way Roma in Europe are. I don't see them as perfectly analogous at all. There's even a world Romani congress whereas there is no such organization for homeless people. homeless people might tend to be from certain marginalized groups more often than not, but they aren't inherently from any one group. Hope I make sense. Not trying to minimize anyone's victimization here, just drawing a distinction.