Giving the benefit of the doubt, Screws You!  

I do agree with you that we doesn't have to judge the person in each cover........

No person is a perfect person and we all interact with people differently. It's not fair not to give a person the benefit of the doubt, especially if you don't know them! Granted, don't share personal information with people you don't trust. Don't leave your house unlocked. Don't leave valuables where they can be stolen. Use common sense! But when you say we shouldn't judge people but everyone does it anyway, that shows that it's still wrong. The extreme of what you are talking about could be genocide, internment camps or segregation!