It's their way of commemorating their victims and somehow in the process the second largest group slipped through. I don't want their way of commemorating their victims in my home Poland.
In this case the stones mark the places where the victims lived.
I assume most Polish victims did not live in the territory of present day Germany.
From personal experience I recall some with "eastern" names in a town that used to have a notable polish minority but I couldn't say for sure.
Btw Can you recommend places to visit to learn more about their stories and history (besides the former sites of the concentration camps)?
Think about where we would be if we hadn't gone down this path. We can all help move things forward if we meet each other with an open mind, and steer clear of the resentment and national chauvinism of the past.