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You say all of those things and the mention the Soviet Union etc. Which makes very little sense because if modern Western countries have enacted socialist policies then the USSR couldn't have been "socialist" (or the other way around).
Also what do you mean by "productivity"? Because by almost any measure it has been going up by quite a lot over the last few decades.
I also fail to see how premise leads to conclusion.
If you want another wacky theory here's mine: imho capitalism unleashed (extract every single penny) leads to less time to be active in a community because people have to work more.
On another hand loss of religion leads to hedonism - satisfy the immediate needs.
Combine the two and you get what we have today.
Society isn't an algorithm that should be optimized for max efficiency/productivity anyways. A completely unregulated market like you allude to is like an ouroboros. It will consume itself because unchecked growth is unsustainable.
It turns out that I meant to strive for all my life is called "wu wei", but it's not well known in our culture, so "efficiency" seemed like the closest match to what I was seeking.
Steal from "normal people" and nothing happens; steal from the owner class and _then_ see what happens.
The pettiness of the crime doesn't matter, what matters is the class the victim belongs to. That's a feature of capitalism.
"Corruption" is not an exclusive feature of socialism.