Reasons Hitler lost was:
- he went too far after hitting the Jack pot (Poland & France);
Wow: he did it and these victories made him thinking he could take it all!!!
But Germany had limited offensive power, which he did not realise enough.
But wenn going further he should have:
- commit all Luftwaffe units against Britain in 1940 and operate with a plan to anhillate the RAF on its airfields and in the air.
But wenn this turned out to be a failure:
- he could have go for a strong Cyprus/Turkey/Syria variant to get to the oil in Iraq.
But wenn he still went further invading the Soviet Union (which was a bad decision):
- he could have been friendly to the Ukrainian and Russian people. With this approach he could have beaten Stalin.
But even when Stalingrad emerged:
- he could have used the divisions freed after the fall of Sevastopol to bolster the 2 drives to Stalingrad and the Caucasus: now he sent 4 best units to France and an army (11th) to Leningrad. If they woould only have been present near Rostov as a reserve, Hitler could have avoided the Stalingrad disaster, by using these forces to counterattack.
After Stalingrad Germany could not hope to win anymore.
Germany was stopped at Stalingrad. Thereafter a lack of infantry made any operation hazardous: Mansteins counterattack, Zitadelle… they failed because a lack of infantry and this problem worsened after Kursun, the Crimea, Brody, Tarnopol, Vitebsk, Bubruisk, Orsja, Minsk, Vilnius, Brest, Falaise, Kishinev, Budapest, Warschau, Heiligenbeil, Danzig, Königsberg, Breslau, Kolberg, Berlin and Halbe.
So Hitler made a series of mistakes and threw all what was gained away and even worse: destroyed Germany till in its veins and core !!! When he was not to win, Germany did deserve its destruction.