Well it's in their self interest to deny any culpability. That way older generations could say "Jews get out of Poland! Go back to Palestine!" And younger generations can say "Jews get out of Palestine! Go back to Poland!" Without acknowledging that taken together, these statements show they just don't want Jews to exist anywhere.
>>f33d51+g
If a genocide survivor showed up on my doorstep with nowhere else to go, I hope that my reaction would be: Welcome fellow man. You must be desperate. How can I help.