This comment by JoshuaZ was, when I saw it, voted down to -3, despite the fact that it

• addresses the question it's responding to
• gives good reasons for making the guess JoshuaZ said he made
• seems like it's at a pretty well calibrated level of confidence
• is polite, on topic, and coherent.

I downvoted that comment and encourage others to feel free to downvote any comment of a type they would prefer not to see on less wrong. Most (but not quite all) cases of people using social politics to force their preferences onto others are things I wish to see left of. This includes but is not limited to sex politics. Being 'on topic' is no virtue when the topic itself is toxic.

At your prompting I have downvoted the parent of the comment in question. To whatever extent a comment is justified by being an answer to a question the asking of said question must assume responsibility. For the same reason I have no objection if others choose to downvote my own contributions to that thread for what could be considered "Feeding". Kawoomba has a good point.

Note: This is a different issue to the systematic downvoting of a user on all subjects (sometimes referred to as 'karma assassination'). That is universally considered an abuse of the system. However the example you give only demonstrates your subjective disagreement with the evaluations of some others regarding the desirability of a particular comment.

You have defined your campaign by references to "this sort of abuse" where 'this' refers to comments like the example comment being downvoted. As such I cannot support it. People are allowed to not like stuff and vote it down. If you had instead made your campaign to be against karma-assassination then I would support it. I myself have lost several thousand karma in bursts like that. I suggest revision.