Because we need to.....unify in this country, despite our differerences, because of them ! 

Unify, to come together, become whole, in that we're all different -  we have that fact in common.  We all have reasons for why we think and behave as we do, conscious and subconsciously. All of us have goals, purposes, objectives. To get along, we need to communicate these commonalities and, with respect, strive to understand them, collaborate, compromise, then co-operate -- give and take.