In what way are we supposed to relate to the chassidei umos haolam during the holocaust such as Irena Sendler, Carl Lutz and the entire Denmark?
The gemorah Sanhedrin (105a, Rambam Hilchos Teshuva 3-5) says that chadsiei umos haolam (righteous gentiles) have a part in the world to come. The Seforno (Shemos 19-5) says that they are cherished by G-d. We are also to have hakaros hatov to them, and praise them as we say, “v’gam charvona zachur latov”.
Megilas Eiva pg. 93 ftnt 4.