Put a machine gun in your hand and the stereotypes begin.
I understand your point. Someone in a business suit and tie can be just as dangerous as someone we assume is a violent drug dealer. It is tough to overcome some of these stereotypes that society introduces us to. I am no stranger to the tattoo parlor myself-people often tell me in shock that they had no idea I had all of those tattoos. Does that make me dangerous? Absolutely not!
BTW, some of the most kind-hearted people I have ever met look much like the picture you posted.