* Almost everyone believes that they are right and that their values will make things better, even people who strongly disagree with each other.
* Almost everyone believes that their own values and beliefs are well-supported or obvious, even people who strongly disagree with each other.
These two things are incredibly difficult for people to come to terms with. The corollary to these, which in fact leads to the real problems is:
* Almost everyone finds it extremely difficult to believe that those who hold beliefs or a belief system fundamentally at odds with their own could mean just as well, or even more challenging, be equally 'right' in the context of that system. That is, "there's more than one way to skin a cat".