I know someone whose mother went as a young woman to the USA to get married to an American, I think it possible she saw the country in a similar light as many aspiring to go there to live. Within three years she was leaving for good, she found the place appalling, not only disappointingly unpleasant and in some respects backward (people had no indoor toilet) but certainly worse than where she came from which up until then presumably she thought was not in the top flight whereas the USA was widely assumed to be. This was just after WW2. She, her husband and the child left the USA and settled in her country where both lived out the remainder of their lives.
She had a good place to return to and one presumes was not utterly committed to leaving it in favour of the USA. On the other hand, people who live there whether as second generation immigrant stock or as child age immigrants see the USA as their home. If these people see something needing improvement, change, are they to be hounded out of the country as traitors for suggesting not all is well ? It is a familiar concept and so too is the reaction hinted at.