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.
Tolerance is not hard to find, it is already in the understanding of a person but it is easy to neglect not by a person that has a moral standard but by those extremis religious group of people and those who are not religious but very selfish. The only thing that can stop it is only through understanding about the value of moral standard. Moral is not if love does not exist on someone's claim about it.