Who said that? Memoirs from survivors suggest that (as one would expect) the experience left them scarred for the rest of their lives.
The point is not that anyone is trying to find the positive side of concentration camps, as if such a thing existed. The point is that some people managed to keep their spirits intact, and, in the words of the poster above, find peace, meaning and value in their lives even in the worst condition imaginable.
Is it lame to remember that even when we can't control our external circumstances, we still have some ability to control our response to those circumstances?