In order for humans to learn and adapt to their surrondings efficiently and rapidly, we tend to classify things of the same type, pattern, nature or order together into groups. This also means that may assume certain characteristics of certain things just so that we do not need to analyse what they actually are. We may also generalise so that we do not need to spend too much time and effort in getting to the bottom of things at times. In other words, we take things for granted.

As a result of this, stereotype happens. It may be true most of the times, or at significant moments, but there is also the possbility of it not coming true or happening. But because in this society we are so concerned with results and achieving them in the shortest time possible, we choose to ignore the small percentage and concentrate on the norm or the possible scenarios. We put people into this mental cage in our mind, not allowing them to expand beyond their normal limits, not giving them a second chance at things, not helping them to become a different but better person. :p