There are a few ways that some people hold Jews accountable for the holocaust. The truth, ignore it or not, is that there are substantial numbers of people in many countries that see a pattern of actions by powerful Jews that is seen as leading to events like the holocaust. The argument made apparently by the fellow, 'Jews cooperating', is very clever. He is giving his opponents the low fruit. A smart person would address the dangerous argument and ignore the low fruit.
PLO official: Reports about Abbas' resignation from political life very premature (Haaretz)
from the article: Leading Polish professor blames Holocaust on the Jews