This is my basic reasoning (correct me if I am wrong). Most people are naturally empathetic and so something close to anarcho-communism would be possible if it were not for the pathologically selfish and callous. Since I've seen studies that indicate that extreme callousness is genetic, I don't think it will go away. Since a significant number of people have this selfishness, they seek societal gain without sufficient empathy towards others. In other words, they seek power over others for cold, rational reasons. This causes others (justifiably) to fear that they will lose power over themselves and makes them selfish- not because they are bad but because they are afraid. This leads to a society in which either there must be no underactive consciences (which seems impossible to me) or there must be no fear even in the face of deprivation (which also seems impossible to me) for anything approaching anarcho-communism to work. If there is an alternative solution to this problem, though, I'd definitely like to know about it.

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"I am a Tory Anarchist. I should like every one to go about doing just as he pleased- short of altering any of the things to which I have grown accustomed." (Max Beerbohm)