We need to reject any politics that targets people because of race or religion. This isn't a matter of political correctness. It's a matter of understanding what makes us strong. The world respects us not just for our arsenal; it respects us for our diversity and our openness and the way we respect every faith.
It's easy to get negative because you get beat down. You go through a few disappointments and it's easy to stay in that negative frame of mind. Choosing to be positive and having a grateful attitude is a whole cliche, but your attitude is going to determine how you're going to live your life.
Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.