Your opinion of something and the strength with which you hold that opinion can vary independently. You seem to think that very positive opinions can only be s

Your opinion of something and the strength with which you hold that opinion can vary independently. You seem to think that very positive opinions can only be strongly held opinions, but GP had a generic positive opinion, weakly held due to lack of direct experience. If the strength of your prior is held fixed, then a negative piece of news should change a highly positive opinion more.