Concentration Camps During Holocaust?

L. C. Martin forgot about hundreds of thousands Slavic Poles that ended in concentration camps (75 000 only in Auschwitz). I wonder why everybody always omit mentioning Poles. They were second biggest group of concentration camp prisoners. And not only Polish partisans were dying in concentration camps. Also many civilians, including children. So it's not only Jews that were murdered in the camps. The average life expectancy in concentration camps was about two, three months.