By your logic, as long as a tragic historical event is referenced over and over again, it's ok for lots of people to doubt or play down its significance. Are you understanding of large numbers of people being against any of the recent black civil rights touch-points, since slavery, Jim Crow, and racism against blacks has been _the_ talking point and justification for contentious events in the US for the last 5 years?
It's fascinating that for the last couple of decades, Holocaust denialism was seen by US liberals as this inhuman and inexcusable philosophy. However, now that it's not just the "evil" right-wingers being called out for buying into it, a common and acceptable response has effectively become "eh, what do the Jews expect?" I'm not aligning with either political philosophy, just calling out the hypocrisy.