I believe this could under the fact that we are the products of our environment. Whatever your environment is about you will most likely be just another person with that beliefs. Which is why there normally isn't any controversy unless somehow someone new moves into the community and then they become just another face in the crowd. Which brings the point of being able to get outside of that environment and study abroad. Being able to do that will allow you to learn other cultural "normalcy." For example, American has been know to slaughter cows in order to eat. But in another country cows are sacred and must never be killed just because of the use of food. To study abroad is the only way we as humans are able to get "outside of the box" and to finally once and for all change the environment we were grown up in.
Some environments are very conservative as in they don't believe in same sex marriage nor dating, whites people are the majority of the population, and of course being a republican. This environment is one of the worse because you are taught under strict values and are not able to see other points of views that are actually in the world. This view could be I suppose a "tunnel" view. All you can see is what you learned from growing up and when moving and realizing that there are so many more views out there then you will feel out of place and amazed at there is actually out there.
This is the same for all environments. Which brings me back to the point of saying, We are and will always be products of our environment unless we moves to a foreign place or if our family life changes drastically.
-The world as we know it has been corrupted to the point where there is no return. What we must do is to clean the whole slate in order to purify it.