We can never expect to have a full understanding of other perspectives without effort. Every opinion is inherently biased towards its own interests. What transforms opinion into perspective is the considered application of information from all sides.
We should all periodically revisit the best books and films on the Holocaust, however unpleasant, to keep our own awareness, watchfulness, and revulsion very much alive. There is no shortage of worthy choices.
Few of my fellow Obama supporters understand what's happening outside of their own circle of friends and families. But Democrats can't win an election by thinking that all voters have the information that we have.