Charles:  Probably we all could use that "diversity" training...or, at least, a discussion or two.  I readily admit that my ancestors owned your ancestors...that's not cool.  Let me tell a short story I always told when teaching "minority issues" in my high school Sociology classes...if you've read it before, I apologize for boring you.....  Years ago my cousin's Grandfather (not min, however) found his Grandfather's diary....read it and found that that Grandfather had shot and killed a man (over a woman they both were "courting") in Yuma, Arizona in 1907.  The GF took the diary to Arizona to "clear up" that old case.  The authorities read the diary, confirmed the shooting had occured, and arrested the GF.  They tried him for the murder, convicted him and executed him.  

My classes sat in stunned silence.  Then, each time, someone would say "hey, man, that's not fair...your cousin's Grandfather didn't do anything, why take it out on him." (cont.)