How easy is it to change your opinion of people?

First impressions are, most of the time, staged acts that keep you from seeing who the person really is. People often "put on their best face" when meeting others for the first time. Now, in the case of David Petraeus(I believe this is who you are referring to), most people only see what the media has shown/told of his extramarital affair and have condemn him for it. What about all the things he did in his long (1974-2011) military career?

I am glad you have decided to look at a broader perspective of things, rather than hold on to one incident. I have no idea about the media person.

First impressions aren't the best guide to long term personal assessment of course, but it can't be helped. Everyone factors in the first impression to some degree. Depends on the situation too. Sometimes first impressions are just the thing to work with. Other times, not.

In the context of a media figure or military leader, I wouldn't go on first impressions. Research them fully before making up your mind completely. Often times the media takes statements out of context.

first impressions you can NOT go on , I have found out once you get to know someone for a long time you see things you never saw before. never judge a book by its cover is a true statement

no, I cant guess who that is , I dont watch t.v. at all ( dont even have t.v. hook up)