Running in primaries against other candidates isn't "attacking dems," though. You seem gleeful that more progressive candidates are losing simply because Sanders' organization endorsed them.
Guess what! There's lots of disagreement ideologically within the Democratic base as well! A lot of people are beyond frustrated with the approaches of the Clintons and Schumers of the world. A whole lot of people were disillusioned when Obama's Hope and Change was undermined by people like Lieberman. I hate that my rep is probably the worst Dem in Congress (Lipinski), it's a shame he barely held on in his primary despite being "attacked" by someone daring to challenge him and his awful policies.
There's plenty of dumb in the Sanders camp, too. Some who'll never reconcile with voting for the least-bad and vote Clinton in 2016 or Booker/etc. in 2020. They want Bernie or someone to his left or they'll sit out. They see the Democratic party as offering little more than half-measures that still largely appease modern capitalism and capitalists because, hey, that's who their wealthy donors are.
But at the same time, guys like you need to realize you're going to have to reconcile with at least some of that more progressive base who's distrustful of the Democratic establishment and the DNC. What good do you think your attitude does? How many potential progressive voters do you think that sort of vitriol directed at anyone who dares to challenge a Democratic establishment which has sucked for a very long time are turned off by it?