Privatised Public Area for Cleanliness

I caught two incidence of uncivilised mind set last Sunday. Early morning, while stopping in front of the traffic light, I noticed a driver opened his door and spit on the floor. Later, I saw a girl throwing her used tissue onto the road before hopping into a waiting car. I just wonder if they will do the same if the car was parked inside their house? I afraid not. They will rather using the rubbish bin or wash basin instead of dirtying their own compound. Everyone is protecting their own interest, and in this case the beauty of their private space. Thus I believe the dirty public place we have is not the doing of others, but rather is the doing of all of us, collectively. For example, it is common for people to sweep the leaf onto the external drain. Similarly, for operator of eating outlets to throw food waste at the rubbish chamber.

This showed that perhaps civilisation can be very personal. On one hand we practice high ethic of keeping our own area clean and green, but on the other hand we can be so careless about dirtying public place. The question is why this happen? Why can't we be consistent to ourselves on practicing same code of ethic regardless of for our own sake or for the benefit of others? Why can't we treat the public place as the private place when it comes to cleanliness and greenery? Perhaps it is good to declare privatisation of public place for raising awareness of the people. This might be worked if all inculcate the sense of ownership over public place, or else enforcement might be the only and last resort, I guess.