judging a book by its cover

Why are we so quick to judge people by just looking at them? When you see a guy with baggy jeans, he must be a gang banger or a black guy with a nice car, must be a drug dealer- there is no way he could afford that legitimately. A spanish person must be in this country illegally. A fat woman that very well could have given birth to twins a few days prior. A young mother with no ring on her her finger.....maybe because her fingers are too swollen to wear a ring. Somebody who is rude, is automatically a bad person...maybe they just found out a loved one has died or maybe they have cancer. Somebody that is acting crazy at a bar and YOU are embarassed for them.....maybe they have alot of stress in their life and need to let loose once in a while. You see a dark skinned person, covered from head to toe in black, boarding a plane- that must mean they are terrorists. It is so ridiculous how fast we judge a book by its cover. People can be so stubborn sometimes. There is such a big world out there, i wish some people would realize this