Do you wear a helmet while riding a bike?

I see many people wear helmets just to escape from the eyes of cops and the penalty.  They are not doing it for their own safety and security.  They think they are smart not to spend too much on quality helmets.  In our country more than 80% of people died out of accidents were not wearing a helmet and almost all of them are young people.  Newspapers publish these statistics almost every other day, but I don’t think anybody take it seriously.  They think they won’t have to face a fate like that ever.

I think in our body almost all organs are reparable, but not brain.  In accidents even our strong skull is not able to protect our brain so an external protection is very much necessary. Do you advocate using helmets while riding a bike?