Funny human's littering psychology

I wonder why people can hold themselves from spitting or throw rubbish on the floor in a big shopping complex but unable to keep the same habit when walking along the hawker stall or walking across the street. Is this some kind of funny human psychology in littering? 

I far as I can see, there are quite a number of rubbish bins can be found along the street. And keeping those empty cans and bottles of drinks or a used tissue paper in your hand till you come across a rubbish bin will not make the rubbish decay in your hand right.

So why litter here and there? I came across many parents who sets a very wrong example to their children by littering in front of them. Dear adults, are you trying to tell them that there will be someone to pick it up? Then why scold them when they do the same in the house?

The restless feeling of wanting to throw the rubbish in your hand right away when you are in a car or walking down the street is surprisingly suppressed when you are walking in a shopping complex.

Make it a habit to throw any rubbish in the rubbish bin. Yes you are just one human being but seeing you doing that, your children will learn, your family and friends might change as well.