Encouraging employers to create diversity

There are many benefits to creating diversity in the workforce. Companies need to make sure their employees feel connected with their colleagues, and that they are always encouraged to do their best. Creating a diverse workforce environment means that there will be an increase in creativity, client relations will be increased, and employee morale will also be increased. Many organizations are not embracing workforce diversity because they are unaware of the numerous benefits that workforce diversity brings. what are some other reason why employers may not want to create diversity in their workforce?
http://innovationzen.com/blog/2007/05/07/the-benefits-of-a-diverse-workforce/
http://www.davidmclauren.com/Connector_April_2009.pdf