Just a little fun.
As you rightly point out the human race has done much in its past to be less than proud of.
I'm always a little suspicious when people use the phrase "tradition", when harking back to a mythical golden age. I chose the above examples to illustrate previous societal norms, which are now, hopefully / thankfully, no longer the case. People tend to quote selectively with regard to tradition, and for good reason. I also find the idea of tradition, for such a historically young country, amusing in and of itself.
Patriotism is often invoked as a divisive measure, to separate the "us" from the "them". A pissing match then ensues as to who is the "more" patriotic, and who is the "Real" American.
I though the only "Real Americans" were on reservations.
Was there a question? More an observation. As an outsider, its interesting to see how political rhetoric breaks down under analysis, when assumptions aren't shared, and some givens aren't.
Implied values often mean "My" values and not "Your" values.
America is a glorious political experiment, that started as a break with tradition. The founding fathers having suffered injustice at the hands of the British, wanted to ensure that those injustices would not be repeated, and understood the frailties of human nature and the corrupting effect of power.
I am impressed by the design. The implementation, at times, could be improved.