Tolerance is a permissive attitude of nonjudgmental acceptance of different lifestyles, beliefs, and freedom of choice. (Toleration has a different meaning: it is the practice of deliberately allowing or permitting a thing of which one disapproves.)
Official state religions have tended to be intolerant of dissenting and minority worldviews. Western democratic societies tend to be diverse, harmonious, and protective of freedom of belief. They honor human and civil rights, and intolerance is seen as a denial of freedom.
In the twentieth century, the United Nations’s Universal Declaration of Human Rights (1949) codified international human rights. The Universal Declaration encourages and legally enforces tolerance of minority viewpoints. However, because many of its provisions violated conservative Islamic Sharia law, Islamic nation-states in 1990 formulated the Cairo Declaration on Human Rights in Islam. The Cairo Declaration imposes significant restrictions on human freedoms, in contrast to the Universal Declaration.
Here’s a paradox: If society is tolerant of those who are violently intolerant, then the intolerant will destroy the tolerant, and tolerance will be destroyed with them. Thus, societies should tolerate no moral, political, or religious beliefs that advocate violence. (Additionally, the term 'violence' has broad interpretation across diverse cultures.)
Conflict arises out of ignorance, intolerance, and misunderstanding. Peace arises out of wisdom, tolerance, and understanding.