1) Invaded USSR 2) Allied with Japan(Pearl harbour gave yanks xcuse to jump into the euro war) and Italy(poor combat record); Alliance with USSR might have secured oil supply(Imagine Hitler to Stalin: We're both socialist, left?) Many krauts during 1930s actually shifted side from commie socialism to national socialism 3) Let go the anglo forces at Dunkirk 4) Failed to fullfil his earlier zionist ideal of jews sent back to Zion.