One person killed through genocide is one too many.
However, most WW II figures include the Poles, the Russians and other Slavic peoples as well, pushing the numbers well past the staggering 17 million mark.
IOW, tis best to remember them all, rather than just the Shoah.
To do otherwise is to build a pyramid of pain, wherein those at the top can play the victim card, in perpetuity, with little or no accountability.