The entire history of anti-semitism would be a fairly good starting place for evidence. Generally throughout history there have been periods where it appears that anti-semitism has vanished and then it is stoked by divisive rhetoric usually under harsh economic conditions. Human beings have a habit of scapegoating and blaming people in the 'outgroup' when things go wrong. That doesn't have to be along race lines (though it often is) - the Rwandan genocide, the rape of Nanking and the Communist revolution are all examples of this in action.

The question of whether this psychological bias can be dealt with directly falls to geo-political and internal national politics. There might have been people dealing directly with anti-semitism in 1926, by 1933 it was too late and by 1942 it was a catestrophic failure of group think.