I feel like even if the vast majority of people were conscious of these things and willing to cooperate you'd always get a handful of troublemakers.
Regrettably,the more authoritarian communist system actually reflect a very conservative view of 'human nature', in that people have to be forced to change, if selfishness...is...built into people's psyche. An authoritarian system is therefore more likely to 'work' in the short-run because it requires people to change less.
And more than a handful of troublemakers. Communism will have to be taught over generations and people do have to be forced to change their ways, or else they don't change. Red Economist has a good handle on why the Soviet system likely failed. People can coast if they only have to change a little. The Soviet system got distracted by war and Cold War and a lot of things, but it also got lax on Communist education. It didn't implement unions and worker's soviets very fully as it was supposed to. It adopted state secrecy, allowing corruption to infiltrate to the top.
I already live with a noisy neighbor problem I can't do anything about. A nightclub opened, that has sidewalk parties all night long across the street from my apartment. There's a city ordinance against that noise, but it's a business so the mayor won't do anything. No lawyer will touch the issue, so I can't go to court and ask for an injunction no local judge would grant. So we have a rigged system.
While I think Communism will have to begin as an authoritarian system, I don't see why it has to be so authoritarian about workplace and municipal issues between citizens. In a Communist society, the town citizens would have a say about where a nightclub could be built in the first place, before it opened, and it would probably have to be a few hundred feet from anyone's house. The effective way of dealing with most troublemakers isn't shooting them, when you can shame them - if they've been educated during childhood to recognize Communist ideals.
Hr zj jSst r xAst Tn xmt n rmt "Why are you going to this land which is not known to the people?" (Urk. IV 324, 8-9)