Currently, some RFCs get a lot of down-votes. This can be especially frustrating and discouraging for new users to the RFC process and Rust community in general. Spending a lot of time on writing an RFC only to have it down-voted a lot may be very bad for the self-esteem of the user which may cause the user to not continuing on improvements or writing an RFC in the future.
Down-votes also have somewhat of an avalanche effect - if one user has down-voted a proposal, it becomes easier to down-vote even without reading the proposal in-depth.
A more friendly and constructive way of disagreeing or showing disapproval, either of details, or the proposal in general, is for one (or several) persons to comment on what they are disagreeing with, and then other people can upvote those comments to show that they agree with that particular perspective. This method of discussion also provides context to the author allowing the author to makes changes to the proposal that are in the direction requested by the user commenting.
This costs more than habitual drive-by-downvoting, but helps the user and the RFC process more, which in turn helps the Rust community at large more.
Therefore, this is a plea for people to not down vote and instead up-vote good comments (and to not down-vote comments either). This is about self-policing and showing respect for the work and ideas of others. And not currently about enforcing a policy (i.e: “legislation”).