Cast-outs or the chosen ones

I always think that people choose to come to the US because they believe what this country stands for. But I was reading George Carlin's "Brain Dropping" and realized that you can look at this another way: that we're all cast-outs from other countries. We can't fit into where we were born. We choose to leave because we can't stay with our own people any more! I think both reasons are plausible and probably both are true. Of course the synergy of these cast-outs is amazing, so maybe it's not too bad to be not conformed.