You asked what Americans gain from taking jobs form the Chinese.Well for one, this answer is a complete non-answer, a non-sequitur if you will. The phrasing and context are illogical enough that the statement can be considered a deepity. You may want to go back and actually read what it is you were answering.
Fro two, taking the above statement on its face, how does "pushing more Americans to work for lower wages like china does" affect their sense of "identity, self-esteem, and purpose"? Is this problematic for you?
I gave you an answer, I assume you're smart enough for me not to go into the psychology of money itself.
Oh, and theres a lot of unemployed people right now with no skills. You give them jobs, you stabilize society.