Never Again?

This is the death record of my children's Great Grandfather who died - along with his brother - in Matthausen Concentration Camp in Austria. They were Polish and were transported there to build the new camp.
His son was my Polish father-in-law when I was married to my German ex husband.
We only found this out a few years ago when I was researching family history.

They say this should never happen again but atrocities are still happening right now as I write this. :-(

https://www.jewishgen.org/ForgottenCamps/Camps/MauthausenEng.html