What about male genital mutilation?

And in general no, like the other commentor said, the german or japanese culture was not eradicated. Just forced to stop their imperialistic aggression.

And the spanish christians you are defending here, did destroy all the other cultures they conquered down to their root and language. Making them slaves. Taking everything of value. Installing a racist regime, with white people on top. Whatever the atztecs did, the spanish did not do better.

If they would have been motivated by freeing the people from the aztecs, then they just could have done so. But maybe that was not what the were after, but rather the gold and power?