That is sadly true.
In places like the US, people are overwhelmingly not raised on hate so we're repulsed by the notion of mass hate. Unfortunately, in the process we often fail to acknowledge places where people really are.
When a population is indoctrinated with real hate (political, ethnic, racial or religious), genocide can be instigated.
IMO, antisemitism worldwide is growing at an alarming rate and I see many similarities between now and pre WWII. Here in the U.S. we are not immune and I see growing hatred toward Jews coming from a not insignificant minority among Christians, Muslims and other religions and even from atheists who want to single out and scapegoat Jews as being somehow "worse" than the followers of other religions.
It's true most people aren't raised "to hate" but when there is an undercurrent of "dislike" toward a group, then it becomes a possibility that when those who do actively hate start to carry out their plans of extermination, it's a lot easier to stand by and just watch it happen.
I think it's a sad historical note that the United States wasn't concerned enough about the atrocities being committed by the Nazis to actually do something about it until we were forced to take sides by the Japanese bombing of Pearl Harbor.