Outsider:  Once again, here is the definition of a sociopath (from Wikiknow): "A sociopath can be defined as a person who has Antisocial Personality Disorder. This disorder is characterized by a disregard for the feelings of others, a lack of remorse or shame, manipulative behavior, unchecked egocentricity, and the ability to lie in order to achieve one's goals." 

IMO, Mr. Trump is not just a sociopath,  he's the posterchild for the disorder.  My "basis for calling Trump a sociopath." is the long and continuing history of his comments and actions.  If you're willing to completely disregard his actions, perhaps you can contend he doesn't evidence those sociopathic behaviors.  Perhaps you might look at his recent actions and comments in Mexico contrasted with those in Phoenix.  Those are just the latest manifestation of his disorder.  

I contend that anyone who is familiar with Mr. Trump and his long history of very nasty business and personal dealings has every reason to oppose him.