People can barely get a grasp on 6 million Jews murdered in the concentration camps, let alone another 4 million "others" in the camps, let alone millions more in combat. Don't even try to get started on how ignorant the world is on how many millions of people were murdered in the Soviet Union (the numbers dwarf Hitler's camps).
People have a difficult time dealing with numbers (which is why the footage of the bodies from the camps is shown). 45million babies have been aborted in America since Roe v. Wade yet it is still "offensive" to educate people about this type of murder. And don't try informing the public that Margaret Sanger was a proponent of eugenics just as Hitler was. "Planned Parenthood" is supposedly about "wimmens' rights".
Now we find ourselves in the midst of a new bloodbath yet we never saw a single dead body from the 9-11 attacks. The media tried quite often to get images of coffins and even combat images of dead soldiers as well as injured Iraqis on the air and in newspapers.
You are certainly correct that we can't really grasp
the scope of such tragedy. Soviet scholars estimate that
about 20 million perished in the Stalin purges and the
gulags. Stalin himself was aware that these numbers
couldn't be truly comprehended. He said,"One death is a tragedy, a million is a statistic." Unfortunately, he
was right about the limited human capacity to absorb
horror on such a scale. This is one of the tragedies of
history and why Santayana said, "Those who don't remember
the past are condemned to relive it."