Tolerance, now a days is a really hard thing to find. People don't seem to tolerate the existence of other people. Especially people don't tolerate other's beliefs. We have no right to kill someone if they believe in a particular religion, what harm does it to you? Everyone should have a right to live their life peacefully and freely.
Humanbings are peaceful and lolerant by born. Ther become influenced by their environment entire their growth. When they learn to tolerate and respect diversity while they are growing they become tolerant. But, if they spend a remarkable time learning and practising furicity or they think themselves deprived, they become intolerant and cause harm to others. So, environment or socio-economic circumstances are significant responsible to make people tolerent or intolerant.