>I wonder if this is any more relevant because of the Turkey thing.
Actually, there is something happening right now, namely, that the genocide, 100 years ago or so, is not recognized as such by the Turkish government.
The other examples you give, while perhaps worthy of denouncing, are not events that were publicly denied, AFAIK.
>It seems to me this would turn our mistake (denouncing Turkey) into a vehicle of opportunity for denouncing ourselves letting us appear humble, and set a tradition of self-criticism in the world community.
That might indeed be helpful.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)