What who calls “America?” I’m not sure whose description you’re referring to.
While there is no doubting the misery Americans - or even the Government - have caused, I believe it unfair to transfer such an opinion to the United States as a whole.
Think of it in terms of the Catholic Church: there have been many priests and Catholics who have caused a lot of misery, but they do so not as the “Catholic Church” but as Catholics who failed to live the ideals of their professed religion.
In the same way, I believe the American revolution is unparalleled in the history of civilization. For the first time in history, a nation arose not from a shared language, culture, or blood-line, but from a collective, transcendent profession of an objective and undeniable belief in our God-given liberty.
This concept is sort of addressed in the article provided in this thread, but John Adams states:
I believe it can be rightly said that any man who disavows Virtue or Morality in speech or action is a traitor to the Revolution and to liberty and hardly worthy of the name “American.”
But that’s just my opinion