By every single concrete measure, you're simply mistaken in saying that. In terms of death toll, sheer human misery and displacement, destruction, impoverishment, post-war political catastrophe (the Iron Curtain being just one part of this) and possibly even psychological scarring, World War II was so much worse for Europe than the first War.
If we look at physical infrastructure alone, the vast majority of Europe at the end of the first war was mostly intact. At the end of WWII, even this wasn't the case, whole cities and large parts of the continent's man-made landscape had been shattered into twisted ruins.
I am sincerely curious to see how you would qualify such a statement that WWI was worse for Europe than WWII.
If we look at physical infrastructure alone, the vast majority of Europe at the end of the first war was mostly intact. At the end of WWII, even this wasn't the case, whole cities and large parts of the continent's man-made landscape had been shattered into twisted ruins.
I am sincerely curious to see how you would qualify such a statement that WWI was worse for Europe than WWII.