Like you I assume Neeson’s friend was white, I couldn’t find any reference to her race anywhere, and few seem to have even asked that question. It is implausible that he would have felt as violated about an assault on a woman of color. And of course, like with most celluloid tigers, there is no record that he has ever stepped in to protect any one from any aggression ever.
Yes, re “perpetrator’s own racial or ethnic group” in peace time, simply because of access.
And agreed about the blackface as well, my suggestion to Neeson was err… blackfacetious.