DSM-5 like all such soft science texts is as much political as anything else.  The libber mentality (which is not the same as a well-reasoned and constructive liberal mentality) personalizes political discussion and subordinates ideas and principles to likes and dislikes, to doing it my way or no way, etc.  I think the libber mentality represents a malfunctioning narcissistic psyche entirely incapable of seeing itself as part of a whole preferring rather to celebrate their parochial views as if given by the God they do not believe in.