I'm not aware of any Sanders followers thinking the actual votes were altered. The voters (in places that had primaries and not caucuses) really did vote for Hillary. The controversy was that the DNC wasn't properly neutral and that this affected the results. Whether the DNC being neutral would have actually resulted in Sanders winning, I don't think anyone can know, though it's probably doubtful. He certainly had a better message than "vote for me because I'm a woman and it's my turn!", and lacked all the baggage that Hillary came with, and had far more charisma (which the DNC infamously doesn't understand the value of), but considering the Republican voters were happy to vote for a guy who bragged about grabbing women by the pussy, I don't think we can assume the best about the voters of any party.
After she won the nomination. What you think was proven is not substantially different from what the My Pillow CEO thinks was proven.
> that this affected the results.
How? https://scholarship.law.ufl.edu/cgi/viewcontent.cgi?article=...
> He certainly had a better message than "vote for me because I'm a woman and it's my turn!"
As did every single candidate. The only people I saw use that justification were the Sanders supporting conspiracy-theorists.
No, not just like at all. The allegations against the DNC by Sanders supporters are orders of magnitude smaller in scale. There's nothing unrealistic or delusional about "Members of the DNC colluded against outsider" or "Members of the DNC all acted independently against outsider for the sake of their own interests".
Also the difference in evidence and reaction is huge.
There is a world of difference between those not being unrealistic and "The DNC rigged the nomination so Sanders wouldn't win."
You could say both sides agree with this, but with opposite interpretations.