If someone is banned from a forum, they can still do plenty of other things in their life, like go to another forum. Or even start their own competing forum dedicated to the same topic, if they feel that the original forum has a bad moderation policy and that its users are likely to move to a better-moderated one (and sometimes this actually happens).
People vanished by the secret police rarely have a comparable option.
True, I was talking at extreme example to demonstrate the type of totalitarian logic underlying Vladimir's argument. Namely, finding open discussion of important issues to be "distracting".
I've gotten sufficient evidence from support that voiceofra has been doing retributive downvoting. I've banned them without prior notice because I'm not giving them more chances to downvote.
I'm thinking of something like not letting anyone give more than 5 downvotes/week for content which is more than a month old. The numbers and the time period are tentative-- this isn't my ideal rule. This is probably technically possible. However, my impression is that highly specific rules like that are an invitation to gaming the rules.
I would rather just make spiteful down-voting impossible (or maybe make it expensive) rather than trying to find out who's doing it. Admittedly, putting up barriers to downvoting for past comments doesn't solve the problem of people who down-vote everything, but at least people who downvote current material are easier to notice.
Any thoughts about technical solutions to excessive down-voting of past material?