Communal Violence

I recently read in papers about the communal violence against Christians in Some parts of Karnataka, especially Mangalore. The attackers, I wish to call them terrorists, claimed the attack was because the Christians were trying to convert the poor Hindus to Christianity by luring them with money and other gifts.
Right to Religion and Right of expression are fundamental rights of every Indian citizen. People have the right to follow any religion they want and people also have right to tell about their views and religion to others and make them accept those views and religion as long as it is not forced or done at gun point.
Many of my colleagues, although they were against the act of violence by the terrorists were of the opinion that Christian missionaries were at wrong as they were trying to buy the people with money. Their argument was these people are illiterate and cannot think for themselves.
Me being a rationalist, my question is, what is wrong in buying people if they are willing to be bought? What good is a religion to a person that he is willing to change for money? Is violence the solution? Can't the terrorists buy them back if they can be easily bought?
Every election we see politicians buying poor people and getting elected. What do they do after coming to power? How come all of us are quiet about the politicians? At least, the christian missionaries have left lucrative opportunities and are trying to serve not make themselves richer.