No group of people is inherently selfish.
Bullsh*t. No one is inherently selfless.
They want what they wont work for
The exact opposite really.
There is diversity within every group.
Human beings are selfish, socialists are human beings.
Humans are inherently selfish, it's an evolutionary advantage to seek resources for yourself to perpetuate your genes (which is basically what evolution is, mutations and subsequent gene wars) and here I use "resource" very loosely. The ultimate question is whether or not the humans act rationally when it comes to their selfishness. I would contend that socialists do not, at least long term, but those who disagree can address me on that later.