Diversity and tolerance are considered very basis of modernity as one of the modernity’s fundamental principles is individual and community rights and also, as modernity implies democratic rule, tolerance and right to pursue any ideology or religion assumes great importance. The western countries consider themselves as role models for democracy and freedom. Mr. Bush, after 9/11 attack often used to say why (read Muslims) are jealous of our democracy and freedom?
Most of us believe in this myth that west stands for freedom of conscience, democracy and liberty. And in theory it is quite correct. But is it is in practice? First of all let us ask one question did they ever consider non-whites, non-Europeans as equal and entitled to equality and liberty? The history tells us no. The white superiority was always underlying assumption and the blacks (now known as African-American) were always discriminated against. Even Jews, until Second World War, did not enjoy equal rights. They were always discriminated against and forced to live in ghettoes, apart from what Nazis did with them.
Also, until Second World War when the Western world was mono-religious and mono-cultural its tolerance for non-western religions and cultures was never tested. It is only when economic migrations began from the erstwhile colonial countries that west began to experience what they now call multi-culturalism and western society became multi-religious and multi-cultural.