[biomene]

I think your point a) about there not being malevolence involved is quite important, and not repeated enough. If you have a world organised around private property and exclusion from what you need, people have no choice but to look at each other as means to their own ends.

Regarding c), I believe a communist would say that in a state-less and money-less society, it is not possible to appropriate wealth in the abstract (there are no means to do it). So it's not the motivation for profit that is abolished, it's the possibility of profit itself.