How to prevent fan wars from forming

Okay we hear and SEE a lot of fan wars when someone bash someone others favorite idol or mv or song or anything from them. And then the other part starts to defend hers/his idol and fight back, by bashing the first one’s idol.. etc, etc.. These all could be easily prevented. First the one who bashed first, he/she has a right to say his/her own opinion, but it could be said in a nice way that no one would loose their control. But sometimes I see that, that one person says that he/she doesn’t like the mv in a nice way and then someone who likes the mv, starts bash the person for not liking it. That isn’t seriously the reason why fans should create wars between other fans! Come on! The easiest way to prevent these is, my personal favor, to not start to bash anyone! Try to stay cool and not to get yourself involved to the bashing. Even if I see someone say something rude from my bias I usually shut up and don’t say anything, because of course I would become angry and all and our minds doesn’t work like they usually would work then. So that means we loose our control when we are angry and we say a lot of things that we don’t mean (I hope so) and that happens at the other party too and then some other fans joins to the party and there we have it: a nice juicy fan war -.- Or of course if that happens that you say you don’t like the mv (or what ever you don’t like) in a nice way and that other fan start to bash you, say to her/him that you are just saying your own opinion and nothing else period and try not to continue the conversation. And if you get angry about the fans bashing, just close your computer and calm down before you answer to her/him. What do you think about this? Could there be a better way of preventing fan wars?