And the main reason they were able to rearm so successfully was that the Soviets had been helping them as it was financially and strategically useful to them.
That kind of undermines the "poor, helpless Soviets" narrative.
I never said they were poor or helpless. But yes, why wouldn't it be to their advantage to play their enemies against each other?
Geopolitics back then was a rough game, and national governments played for keeps. And while they were neither poor nor helpless, the Soviets clearly faced hardships and intractable, formidable foes all around them.
A lot of national governments and people around the world hated the Soviets. Are you denying this?
He wasn't forced into invading Poland. He carved it up with Hitler because he wanted to take more territory, just like Hitler did.
Hitler had to offer Stalin a part of Poland and make other concessions in order to get Stalin to agree to it. True, he wasn't forced into invading Poland, but since it seemed inevitable, creating a buffer zone between Germany and the USSR would have made strategic sense. Having the Germans 200 miles closer to Moscow was not desirable (which would have been the case if Hitler invaded without Soviet participation). Also, the USSR was not ready for war with Germany at that stage. They had just had a skirmish with the Japanese at Khalkhin Gol.
So, I think your contention that "he wanted to take more territory" is an oversimplification of the historical circumstances which were existent at the time.
It's not that it was a few capitalists, it was that soviet industrialisation was made possible by these capitalists.
This is a massive counterbalance to any sabotage if we are making a balance sheet.
I would disagree with your contention that industrialization "was made possible by these capitalists." They may have helped, but as you've noted above, the Soviets were not helpless. They were in the process of industrializing already. I don't believe the capitalists who helped them were very well received back home. Albert Kahn's nephew was later blacklisted during the McCarthy era. That was an ugly time in US history. Not sure if your country went through anything similar.
Hitler said a lot about these internal enemies too...
Dictators tend to rely on such fiendish enemies so they can oppress the people for their own good.
Yes, although I would figure that Stalin probably did have many enemies and people who hated him.
I can't answer for everything that happened, and in fact, I wasn't even there, so I only have access to the same information as you or anyone else.
All I can say for certain is that, in my historical study of not just Russia but any other country where socialists or communists have tried to organize or to help workers, poor people, or others who are oppressed, they have faced utterly fanatical opposition who stop at nothing to undermine, sabotage, and/or annihilate them.
One doesn't need a dictatorship to create "fiendish enemies." Even in Western liberal democracies, it has happened and will likely continue to happen. The Red Scare just after WW1, the Palmer Raids, FBI surveillance of communists or suspected communists, McCarthyism, the Cold War, US support of numerous dictatorships around the world, all in the name of anti-communism (which our leaders deceptively called the "free world").
The bottom line, at least looking at history, if there has been an epic struggle between the capitalist upper class and the proletarian lower classes, then I would say without hesitation: The capitalists started the fight.