First you make an absurd fallacious statement that:
Trotskylvania wrote: Alice says in effect that while the communist system appears utopian, building a communist society is impossible because humanity's flawed nature and greed prohibits production being planned for use, and directed democratically by the community.
What kind of nonsense is this? By your definition it is 'greed' that I engage in trade with someone else in a free, voluntary and peaceful society that makes us both better off or the exchange wouldn't have been undertaken in the first place!
Why is that anything that communists want they have to get by coercive means? Why is it that you should have any business meddling in my life and the life of those I trade with in a free, voluntary and peaceful transaction that has nothing to do with you?
Mind your own business, moreover if you want to live in a collectivist hell hole anywhere in a free society -- then within a free society you have the right and privilege to do so. Indeed, within a free society all things are possible. I won't tread on you, you don't tread on me. Presumably, if your world view is so effective at producing growth and increased living standards -- then you should welcome a free society in which to practice it and juxtapose its success against the 'squalor and decay' of my capitalist society!!!
Trotskylvania wrote: it would then follow that if Alice follows her logic to its inexorable conclusion, she must argue that we should change human nature.
What kind of bullshit is this!
You want to tinker on your brain and physiology, by all means do so, but I advocate freedom from this kind of nonsense. Presumably, you would prefer to make this mandatory and managed by the 'state'?!!
Indeed, where do you come by these barbaric positions?