These two value systems are well articulated  in Don't Think of an Elephant!: Know Your Values and Frame the Debate by George Lakoff.  Exposure to the other matters a lot, ergo much of the conservative lens is found in rural areas in North America. Interesting to read today's feature on indigenous and cities in that context. With over 300 communities sponsoring refugees I think this has done more to break down the fear than anything.  It would be interesting to see the correlation with media consumed as there are lots of US media to feed fear and distrust of the other.