My concern with this line of argument is that it bundles consequences from a system of government up with the consequences of trade embargoes and other hostile actions from capitalist economies. That doesn’t make the actions of the dictators in those countries justifiable in any way, but might have precipitated conditions that made them more likely.
How would communist nations have fared if the US had taken a ‘live and let live’ approach to them? The approach during the cold war was that they couldn’t be allowed to succeed. That led to the sort of standards of living where dictatorship tends to thrive. Note this isn’t unique to communist countries. Look at the Republican party in the US, now that Neoliberalism is failing.
https://youtu.be/_loUDS4c3Cs?si=3voDpwaDOHr9UIsi This one?