Forgivness Please

Why is it that when ever you make a mistake people jump on your back straight away but if you do something right your not even given any credit? I tell you why people are expecting too much and they get upset if you made a spelling error or even said something you shouldn't have. Especially people in the public eye if they were to just make a tiny slip up the media would pounce on them like a tiger. Please people relax, nobodys perfect.