Even back then, most people knew what monsters the Bolsheviks were. After WW I, the allies even sent troops into Russia to fight the Bolsheviks. So backing them in WW II makes no sense. Also, The culture of Russia was largely oriental. Probably due to Russia having had been ruled by the Mongol Golden Horde for centuries. Did the allies not back Hitler because Germany was a more advanced, civilized and "Western" country?
Another reason could be that after WW I, Germany had around 65 billion in GOLD stolen from it as reparations for WW I. A war that Germany just got sucked into like everybody else. But when Hitler came to power, he put a stop to those reparations payments. (Germany made its final WW I reparations payment in 2010)
Maybe this next reason is the right one. Unemployment was rampant in Germany before Hitler came to power. Germans also literally needed a wheelbarrow full of money to buy a loaf of bread with. Could it be that the reason the allies didn't back Hitler was because he fixed all that? Thereby PROVING National Socialism to be superior to what our democratic capitalism was? (Or still is)
Also, Germany invaded Poland on September 1, 1939.: Most likely because of large numbers of ethnic Germans there being murdered. For that, Germany had war declared on it. But when Russia did the same 2 or 3 weeks later, war wasn't declared on them. Neither was it when Russia invaded Finland on November 30, 1939. Then on June 22, 1941, Germany invaded Russia. Most likely because the Germans found out that Russia was getting ready to invade them. One historian said that Germany beat Russia to the punch by only one day! What did the U.S. do when Germany invaded Russia? They started sending Russia supplies and munitions! Even though we weren't at war with Germany yet.
I will give you what I think are the two main reasons why we didn't back Hitler. First, to most Christians, a good way to prove the power of their imaginary god is to support the jewish people. And before war put an end to the program, Germany DARED to deport 60 to 70% of its jews to Palestine under The Haavara Agreement.
The other reason comes in the form of two pictures. The first one is an image from the first "talkie" that the jew Charlie Chaplin ever did. (No doubt there was other anti-Nazi BS jewish propaganda around) The second picture with quote is of a Russian jew named Genrich Yagoda. He was the head of the Russian NKVD. This one jew alone is said to have orchestrated the deaths of at least 10 million people! Our WW II servicemen have been called "the greatest generation." Yeah. The Greatest generation of SUCKERS!