If there is something you disagree with, then comment on it. If a writeup is wrong, comment on it. If you think a question is "stupid," comment on it.

It takes a trivial amount of time to vote something down. It takes a little more time to hunt down an answer.

It is the negative connotation of lazy when a monk votes-- without a comment.

Update
This node has been voted-- with the obvious lack of a comment. Annonymous voting--, IMHO, is somewhat cowardly.