Right, it would make more sense to have a plugin that makes your account automatically downvote any of those users' comments as you encounter them. Or even better, periodically pull up their latest comments and downvote them.

Not advocating that, of course, and it feels contrary to what the benevolent mod team would prefer. And I assume that the site has some countermeasure for that, like it does against upvoting a submission that you accessed via direct link instead from from the main site?