I have often wondered on the wisdom of like and dislike arrows. There are times when a perfectly reasonable post gets a bully down arrow simply because they differ in opinion to someone often not interested or incapable of a postal reply. This is a discussion forum, not a like or dislike game. Being anonomous they can get away with their unqualified downers.
A solution to this is to name the uppers and downers in some manner so that the downers can be known and replied to.