Bernie or bust whiners and enablers

I've encountered quite a few of them online. Surely there is agreement that Sanders is about class consciousness and equality? So now that he's supporting Clinton all that's out the window? Has anyone considered why he's supporting her instead of Stein? Just a sell out? Did you hear his speech?
E.g., Sanders said the following. You really think you'll get anything at all like that from the GOP? And how did we get such a platform? It wasn't just Bernie but we the people who supported him. And we the people will hold Clinton and the Dem Party accountable to that agenda unless we're too busy whining about not getting perfection. Sanders:


"Among many other strong provisions, the Democratic Party now calls for breaking up the major financial institutions on Wall Street and the passage of a 21st Century Glass-Steagall Act. It also calls for strong opposition to job-killing free trade agreements like the Trans-Pacific Partnership."