I completely agree, as does most everyone, but do not agree with the apparent premise that Hitler was the cause of WWtwice. With or without Hitler there would have been a big bad WW2 of some sort.
Regarding Russias ramping up it's economy to fight the Germans, they could have done very little if we had not fed them war materials. Again, if we had not entered the war as aggressively as we did, the baddies could have fought it out, hopefully to our benefit. The last thing Hitler (or Germany in WW1) wanted was to fight the United States industrial collossus.