Because misery loves company. Ignore those negative peeps that brings you down! It's not about them, it's about you. So start paying attention to how you feel. Joy, success, happiness will be yours immediately, and everything else that you have ever thought would make you happy, will start flowing, seemingly effortlessly, into your experience. Just go with the flow on what feels best for you! Gratitude is one thing! As plato once said, when you feel grateful, you feel great, when you feel great, great things comes to you.
Just put those that brings you down in your ignore list. Keep your chin up and don't take it personally when someone brings you down. I agree with you, in 5 years I see US as profitable and successful like Southwest. 🙂