I like your psychological analysis of marxism. It works.
My longtime held psychological analysis is perhaps a useful adjunct as it is not competing but rather complementary.
Marx’s essential incorrect assumption which I think is subconsciously echoed by adherents and fellow travelers is basically this.
It’s simply one of scale and has to do with emotional ties.
If you think of it the nuclear family is one of many social units where “from each according to his abilities to each according to his needs” not only makes sense but demonstrably works and has for as long as humans have been around.
There are probably other social units (tribes, some voluntary associations) where this in fact works.
The error that the marxists make is quite simply one of extrapolation. If something works on these small scales than of course it will work on a national scale. And of course this has been proven to be false.
But since most everyone has grown up in a family of one sort or another and has directly experienced this arrangement, this is the subconscious appeal of this dangerous ideology. So there is almost a psychological weakness that predisposes many people to believe in the false premises (and promises) of marxism since this error of extrapolation is quite easy to make if one is not intellectually rigorous.
I like your analysis and how forms of socialism works on a smaller scale. Such as families and voluntary associations. However, I would add that the one thing that the socialists miss out on with these smaller groups is the fact that in all of these groups it works because there has been a sense of trust and mutual respect built up amongst it’s members. All of these groups you mention only work in this world of socialism because of that trust and mutual respect. This is impossible to replicate on a national or international level with people of disparate wants, desires and needs.