If they surrendered, a lot of people would not have died, I am just stating that fact, they went to war and got slaughtered when all of that could have been avoided, it is that simple.

No, because of nazi racial policies that point is factually incorrect. Nazis didn't do the submit or die schtick with supposed enemies of their race or untermensch that needed to be cleansed.

For those millions of Poles, Jews, Russians, Ukrainians, Czechs, Belorussians, Tartars, Estonians, Latvians, Lithuanians and plenty more, death would come no matter if the submitted themselves to German subjugation or not, the Germans would hunt them down either way. It is one of the remarking features of the Nazi German state.