I think understanding different cultures is required for every person because the perspective directly connects to the respect the person who belongs to the culture. The action starts from small steps. Even if it is a small action, you can make big impact  eventually by keep the action going. Also, we can work together to solve big problem. For example, while learning and working with others, we can exchange different ideas and gain more insight. That insight might be new solutions to make the society better. In conclusion, it is necessary to work with different people.