One way we can help change the world for the better is to have the courage to stand up for the truth. Standing up for the truth takes real moral courage and intestinal fortitude, and it may mean being ostracized from others. It’s not easy. Oftentimes it’s far easier to go along to get along than to stand for the truth. But if you stand up for the truth in an honest, respectful way, I believe that in the long-term you’ll be vindicated.
Take for example the different political parties: most fair minded politicians agree on what is true, what they disagree on is how best to solve the problems, and that is what they debate over. Some politicians will purposely lie about something, so it's important to check the facts before you believe them. Some political pundits will make a mountain out of a molehill or vice versa. Once again check the facts and decide for yourself. Moral issues are another area of debate as moral relativism is quite rampant in our world today. All you can really do in these cases is to have the courage to stand for what you believe in as you cannot force someone else to believe as you do. But I think if you stand for what you believe, in the long-term, you'll be proven right.