The families of the 20,000 Polish officers murdered at Katyn would beg to differ with that statement.
Note that I added to Praeger's #1 Add to that the fact that, unfortunately, successor governments in nations like Russia, and governments in China and Cuba, acknowledge no particular abuses of human rights. Like it or not to this day Russia doesn't acknowlege their responsibility, much less that of those involved, and Poland didn't even discuss the issue for over 4 decades. Yes, I know why, but that's why the outrage is missing.