One must remember the views of today were a lot different way back when...and way back when, I don't think anyone could imagine the societal views of today.

Personally, my guilt starts about 45 yrs ago when I born as it turns out to a couple white people.  I suppose I should be guilty for my parents and their parents but being guilty for myself is enough.

Sure, let's continue to focus on the past and how we can change what happened in the past...but if you're always looking in the past, are you not missing all that is good in front of you?  In other words, build a bridge and get over it.