I have no problem with disagreements. I think they can be used to a healthy end of self-expression, and self-awarness. However I do have a problem with name-calling, and downright dirty behavior from people. They are not just disagreeing, they are lambasting and power tripping. When a disagreement degenerates into an arguement/flame war it's not helping anyone.
I too disagree with Crystal. I believe in positive thinking, but I don't think it can cure a chemical imbalance (which is what clinical depression is). However, recently I posted something many people disagreed with and was quickly ganged up on and verbally attacked. Not disagreed with, but attacked. I think there is a big difference between constructive criticism, finding flawed reasoning, and just different view points. Some people let their emotions and wounded pride take them too far. So rather than participate in a group attack, which is what I feel it had degenerated to, I just kept my opinion on that subject private.
Sometimes I think here, with the protection of monitors and a million miles, it is easy to get downright mean and nasty, and that doesn't do anyone any good at all.