I agree! Clinton is too loyal a Democrat to go against the nominee. He wants the entire party, including the Obamunists, behind him and Hillary for 2016. If he burns bridges with them now he’ll just have to rebuild them later.
It’s all about creating a false perception of controversey and conflict, because controversy and conflict sell. They WANT people to watch, knowing full well that the audience won’t remember WHY they watched once the speech is over.