it is not the first time such an incident has taken place. most male students in india have become like this and with time as their parents get richer they all would like to show gun. these things happen where, generally, the father himself is a person who takes pride in his "aukaad" and there have been violences at their home. also in this case the environment is to blame - that schools are nothing more than formality in one's life, all values and education comes by self,parents and tutions.
