Whoa whoa full stop.
The view of the Soviet Union as an evil menace started on December 30, 1922 when the treaty of union was signed. Everyone hated their rotten guts for repudiating czarist debts, making peace with the Germans, and that whole "we're going to export our revolution beyond our borders" thing but who's counting? Everyone and their grandmother was terrified of the Bolsheviks, right-wing extremist movements like Mussolini's blackshirts and others would NEVER have gotten where they were without that kind of cult of fear and uncertainty that pervaded the Interwar Period, a good deal of which was attributable to the revolutionary regime and the devastation the Great War had wrought upon the traditional order of things. Nations don't just intervene in a massive civil war right on the heels of what was by then the most devastating conflict ever waged in human history, that is not suspicion, that's outright hatred of the new regime.
Normalizing economic and trade relations was not necessarily a sign of trust, it was just a period of "well we don't have much trade because of that whole Depression thing going on so let's pal around with the people who are only marginally affected by it" this rapprochement was primarily economic in motivation, and doing something as simple as recognizing the Soviet Union as a nation despite it being 12+ years old is not the most encouraging sign of a new era of Soviet-Western cooperation.
I agree wholeheartedly. In the case of Stalin it was a matter of not overturning a precariously perched applecart, and with Mussolini it was a simple choice, ally with Hitler, or be overrun by the fucking Nazis. An attack on Nazi Germany by Stalin's Soviet State in '42 would have been impossible. The Soviets didn't have the strategic vision, the tactical know how or the logistical command and subject wherewithal to accomplish such a feat.