No superpowers are immune from committing these crimes.

The sad thing about living in the empire built on these crimes is that they are so all-pervasive, it becomes second nature to see them as universal. Like a child born into an abusive family who sees the abuse as normal. Their parents tell them, in between beatings, that anyone who claims not to live this way is lying. The child slips into state of depression, believing that humanity itself is simply like this everywhere. They see no point in striving for better, because better doesn't exist. When more and more people tell the child that this is wrong, that other people in fact do not live like this, the child may lash out in anger and denial, too afraid to entertain hopeful notions. "There is no alternative" becomes the accepted wisdom. Fear and spite close the curtain on curiosity. The cycle continues.