I kept thinking about this and I would like to share my insights based on what you have commented already. I see different aspects about this:
1) the definition of the Wikidata culture: which kind of behaviours we want to see more, and which ones less (this has been addressed already on other threads).
2) the recognition of good/bad behaviour. How can each one appraise actions or comments? We have a "thanks" button which is great to give positive feedback easily, but what about other kind of feedback? And how can we keep track of it as a community?
3) the effect of good/bad behaviour. Here I would like to see more ideas on how to give more influence to those who promote the wellbeing of the community, and how to reduce the weight of those who behave in a way that create a negative atmosphere, so that they reconsider their behaviour. Bans are for extreme cases, are there softer tools that we can use?