"yawn"
I do not understand your indifference? Are you human?
Other than the possibility of being a troll, there's also the possibility that the sheer concept of millions of people being exterminated to attempt genocide is so far beyond a lot of people's concept that tossing such numbers around either numbs or approaches irrelevance.
I found the same thing with most of the classes I taught, until I came up with something to convey the point
At the beginning of a class, at the start of a Holocaust unit, I run a little math problem past the students: If a sheet of paper has 4 columns of names, and each name has 54 lines (which is about right for a standard 8.5X11 sheet of paper), how many sheets of paper would it take to list 6 million names? With 500 sheets in a ream, how many reams? With 10 reams to a case, how many cases?
After they come to the realization that it would take a little more than 5.5 cases, I hand them sheets of paper with, yes, 4 columns, 54 lines printed on them. As they leave the classroom, they get to drop the papers into the top of a half-full case of paper.
Oh, the names? No, I don't know that many names. Instead of names, I have printed,
This was someone's mom.
This was someone's brother.
This was someone's uncle.
This was someone's dad.
This was someone's sister.
. . . and so on.
Most stop looking at the Holocaust from a bored, detached viewpoint after that.