That American "Snub" to the Poles

Earlier this week I wondered why the U.S. sent such a low-level delegation (led by National Security Adviser James Jones) to the Warsaw commemoration of the start of World War II where Chancellor Merkel and Prime-Minister Putin came to represent their countries. My best guess: the administration decided that this wasn't really their commemoration, just like the U.S. back in 1939 didn't really believe that the threat of war in Europe was its problem. We weren't there back in 1939, so let's keep a low profile now also. (I know, doesn't really make sense).