You're making the mistake of assuming an attribute of a culture cannot be accurate unless it's 100% accurate about every member.
I think it's perfectly valid to call Americans to the carpet when they won't live up to their stated principles, if only because of how obnoxious they've been about their own sense of exceptionalism, and how their guns serve as an absolute vouchsafe against tyranny.
History is going to note that the only times Americans attempted a revolution against their government was first in defense of slavery and second in defense of fascism, and that isn't a good look. Replying with #notallamericans doesn't help.
edit: OK partial mea culpa as the US had anti-slavery revolts[0], but the two events that will stand out for their lasting impact and scope are the Civil War and Jan. 6th. The Revolutionary War doesn't count because they were British at the time.
[0]https://en.wikipedia.org/wiki/Slave_rebellion_and_resistance...