Would you agree that Kevin Durant is a complete and total coward? He joined a 73-9 team, that he was on the verge of beating. His cowardice has ruined the NBA completely

Not at all. His contract was up, Durant wants to win championships, and the GS Warriors were happy to have him aboard. That said, I agree with Hippy. 

I do think however that there is a GREAT DEAL of cowardice in anonymously trolling famous people from behind a keyboard.