Judging a book by it's cover or better yet, judging a person by their appearance is never accurate. A person's character and personality have very little to do with how they look. I'd like to think that I'm a very peaceful person, I don't like trouble, I despise fighting and I'm definitely a pacifist but people tend to believe otherwise because I keep a reasonably large beard and I lift weights alot so I'm pretty big.
In my country Nigeria, we have a lot of hoodlums and violent cultists who basically match my description and as such when people see me they sometimes think I'm one of them.
Judging a book by it's cover is never and can never be accurate. Who a person is can never be determined by the clothes that's on their back or by the way their face or bodies look.