I'm saying that the tracing back is justified. It doesn't really matter how long ago someone was dehumanizing someone else because we are all still dealing with the fallout.

People pass on their attitudes-- this is part of the reason why there are acquittals for folks like Darren Wilson. I'd wager the majority of the folks involved with that verdict are linked to generations of racists like those in the lynching postcards. Anyway, there's only one way to find out.