No, you're right, it isn't more important, but
A) the journey and history of the Jewish people is important to history because of their assimilation into so many European cultures, and their place/role in the Middle East;
B) because most European cultures are Christian, they will place a certain amount of importance into tracking what the Jewish people have done;
C) the holocaust has become part of the Jewish identity, since they were targeted so aggresively and openly;
D) the Jewish lobby is quite important in most of the nations of Europe and the US - I'm not making a judgment call, just an observation;
E) because the holocaust was so bad for Jews, and because of their neglect and abuse by Europeans in the past, there was almost an insistance by many to only focus on what happened to the Jews in the holocaust renderings.
I'm not trying to make a value judgment, just a series of observations from my study of history, that's all. You're right, though, that public consciousness is needed on the fact that, like, hundreds of thousands of Poles, and Russians, and tens of thousands of Greeks, and Serbs, died in the concentration camps, and hundreds of thousands if not more Greeks died of forced starvation in their own country, et al.