Why is it that one can question any
event in the history of planet Earth and not get thrown in jail with the exception of "The Holocaust"?
When you have a truth that is protected by the threat of imprisonment naturally people are going to wonder what there is to hide.
Furthermore, it appears that the 6 million number that has been offered has been in constant use with regards to Jews for decades before WW2.
Do I dislike Jews in any way? Nope! Am I skeptical the 6 million number has been vastly inflated for political gain? Yep!
https://www.google.com/search?q=Jews+6+million&biw=1366&bih=651&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwimw4va1-nOAhVO12MKHcyRBRcQsAQIJQ&dpr=1