Socialism is not the same as Communism... Scandinavia is, in my opinion, more socialist, than Russia ever was.
And there is absolutely nothing wrong with social equality as an idea. Not being able to implement social equality universally and/or properly, should not be an excuse to abandon it's pursuit.
An argument regarding human nature is pretty much irrelevant, since every law out there, is against human nature, but that doesn't make them wrong or unneeded. Otherwise there wouldn't be any need to write them down. f. ex.:
It's not in human nature to sniff each other's assholes when we meet, and so we have no need in laws restricting this activity explicitly.
It is in human nature to smack each other around, so we need many laws restricting these notions.
I like socialism as an idea, and have no pain in my ass for paying 40+% in taxes. But that is of course, because i know my money won't be stolen - my faith in local official's integrity is almost religious.