NBA players have a habit of believing themselves capable of any and all accomplishments, to the point that it's usually not sensible to rate their statements by any sort of external logic. It takes a lot to succeed in the best sports leagues in the world, and unrealistic confidence is usually a factor.
It was therefore not especially shocking that Golden State Warriors wing Klay Thompson said this weekend that he believes the defending champions capable of becoming just the second team in league history to reach 70 wins. Most pundits have taken 2014-15's franchise-record 67 wins as a best-case scenario for Golden State, and initial responses to Thompson's comments followed a similar train of thought.