By David Shribman
One displayed the breathtaking depth of human charity, the other the horrifying depth of human barbarity. One was a surpassing expression of decency, the other an ominous expression of depravity. One was a symbol of transcending humanity, the other a symbol of transforming inhumanity.
They were separated by 75 years and -- incongruously, incompatibly, discordantly -- we mark important anniversaries of them both this very month.
David M. Shribman is executive editor of the Post-Gazette. Follow him on Twitter at ShribmanPG.