Why attack public vehicles?

In Bangladesh violence is the answer to everything. When students get angry with anything, they start vandalising and burning vehicles. And violence soon spreads outside the campus. If a problem arises in a garment factory, the workers take to the street and try to establish their rights through acts of vandalism.
The same happens during hartals and blockades as the supporters of the opposition party burn and vandalise public vehicles indiscriminately. Don't they understand that they are destroying the country's assets by  such violence? Who are suffering? It's the people, not the government. Have the blockaders succeeded in putting pressure on the government by doing so? Not at all. Attacking public vehicles can not be the language of any protest. Protests should be peaceful and effective.