Diversity of cultures, beliefs, race, values are very important in the evolution of humans.
I think it is necessary, some 40 years ago or even thought of something so, we were ignorant of other ways of life, beliefs and cultures of other countries. Why? Because it was not important at that time but we are now in a globalized world so it is very important to know the feelings of other people with cultures different from ours because they see life from another angle to ours, even this can give us another way of thinking the things.