They grieved for years during the war. There wasn’t much to do after the war but to get on with life.
Depends on who you mean by “they”.
The “bigger” nations got a big boost thanks to US aid. And then “they” had the distraction of the Cold War, under which “they” could do a lot of things under the radar.
I can understand that. After all the physical and emotional pain, the anguish, death, destruction, and devastation all around you, I could see that it would be difficult to openly grieve more and squeeze a tear. By nature, whether we voice it or not, we often lay the blame for our own trouble and misfortunes at the feet of others. I can see the difficulty for common people, going about their private lives, to connect the dots on how they may have personally contributed to the war and holocaust, whether by some action or inaction of their own doing.
I am not willing to condemn all Europeans for WWII when I look around and see the ignorance, self-indulgence and licentious lifestyles that are causing our country to go to hell in double-time. Our citizens do not see their indifference, lifestyle choices and morality as putting our nation at risk. There were those in Europe that saw the danger, too, only to be swept aside by the propaganda fueled lemmings. It is hard to be critical when we are traveling down a similar path. I wish I were wrong.