Those emails are from April and on, correct? After Bernie was mathematically eliminated (unless he was able to win 80% of remaining vote)? I can understand someone making the case that they should have held off until he dropped out to move into general election mode. That needs to be addressed. I doubt it had any impact on the primary, though, by that time Bernie had already technically lost. Bernie lost because he ignored the South - can you show me the email where the DNC forced him to do that? Bernie lost because his coalition wasn't that strong. Definitely not as strong as the Obama coalition. And his campaign was a mess (see the email above). He lost by 3.7m votes. I guess they were all in on it too. You can be bitter all you want, but that won't change anything and you can't directly where there was collusion.
For that Nevada thing, I wouldn't apologize either. You had Bernie supporters doxxing delegates and threatening and harassing them. Some of those people were unhinged.
Also, keep downplaying the attempts to drive a wedge between Clinton and Sanders supporters.