How can some think the US is the land of opportunity for others, yet want to leave because it's so bad?

How can some think the US is the land of opportunity for others, yet want to leave because its so bad?

Without mentioning specifics, we know that there are some people who believe everyone should come to the United States, and be let in, because the US is the land of opportunity. Yet, some of those same people believe things are so bad in the US that they leave and move to other countries... some of them later return to the US.

Does this make sense? Can someone explain this apparent contradiction?

How can some think the US is the land of opportunity for others, yet want to leave because it's so bad?
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