This article from the Junk Food Science blog includes the following statement that holds true in any area of life, business or politics:
[They] ...isolated themselves from anyone who didn’t share their beliefs — something very common among those who get most caught up in beliefs and fears. They come to distrust anyone else. When all we hear and read is from those who believe as we do, it’s impossible to gain a balanced perspective and to see the truth. It also makes us more vulnerable to those taking advantage of us and manipulating us with fear.
