I understand where you’re coming from, but if you think about, American culture derives directly from our immigrant’s culture initially. Not to mention, every generation has or will bring a new brand of American culture (hence at the centuries of continual clashes between mature v.s. young generations).
Everything in our culture is going to continually evolve because we are lucky enough to live in a free enough society that present social aspects are able to be challenged and changed. A society of free-thought and free-speech will never allow a nation’s culture to stay stagnant and stand unchanged for future generations.
Holding on to the past and refuting any change in our culture based on principle alone goes against the our founding father’s intentions as it only shuts down society’s evolving process that free-thought is suppose give way for.
At the same time, it is still important to preserve a few aspects, through our nation’s history, that continues to help bring our communities and our nation together.