Red Thumbs are like talking behind some ones back. If you have an issue with someones comment, then put up (your own better comment) or shut up. Red Thumbs are about as close to anonymous cyber bulling as you can get.
Forums are about discussing topics of interest and Red Thumbs are not constructive feedback. Some people are more then ready to knock what others say, but have nothing worth while to add themselves. You see this in the work place where people, who are in a manegerial position, are unable to make decisions, but jump on anyone else who does. There, I said it.