Probably a hot take but I feel there was something wrong with the mentality of Soviet people

only hot here, decades of a dictatorship masquerading as socialism has caused endless damage to the "brand" of socialism, when it was not even close to actual socialism in the first place (the people weren't in charge). it's just sad at every point, especially when you figure out how much of that degradation of the socialist state was caused by foreign actors. there's a reason the system fell, and it's taken this long for people to realize just how horrid capitalism actually is and finally start openly admitting that they preferred the stability and equality of the previous system (even with it's massive flaws).