I think that the word "community" has excess baggage for you which was not my intention to dredge up.

Of course you don't do anything because it is "for the community". Virtually nobody does. Functioning communities operate because the members have other reasons for being there, and they operate well because there are other incentives driving that which align well enough with the good of the community to serve. This is the case whether we are talking about a community which is a company, city, nation, members of an online forum, or devotees of a programming language.

Those other reasons are maintained by community mechanisms. In online communities, the desire to avoid being criticized by other members of the community is one of those mechanisms. And in the grand scheme of things, this is one of the nicer mechanisms by which real communities get maintained.

For lots more about this, the best book I have read recently on communities is The Logic of Collective Action. Highly recommended if you are interested in both economics and how communities work.