The NYT has more details about what happened with the plea.
How a Plea Deal in the Arbery Hate Crime Case Unraveled
For those who are stuck on this side of the Times' paywall:
A. About the pleas.
1. The DOJ did speak with the family "multiple times," & knew they were opposed to the deal.
2. DOJ took a plea deal to family in early Jan (30 years, admitting guilt, see post above) shortly before State trial sentencing. The family said no, and the DOJ "shelved it."
3. By around Jan 28, the DOJ & MM attorneys had "hammered out a deal." *Before* the deal was finalized, DOJ prosecutor Lyons' team presented it to the family's attorneys.
**"They were told at that time by family attorneys that the family "would not oppose an agreement."**
4. Prosecutors held a number of video meetings with the family & their attorneys on Sunday, the day before the plea deal hearing. Lyons said it became clear during those meetings that the family was opposed to the plea deals.
5. Lyons told the judge she had struggled herself with what was the right thing to do, and while she recognized & understood the family's pain & objections, she believed the pleas served the goal of justice.
6. The judge did not say she was rejecting the pleas due to the family's objections, "and experts say she may have other reasons." (It's suggested she did so because the deal didn't allow her to exercise discretion over length of sentences).
B. More generally.
1. Federal prosecutors do not represent victims. Victims have a "reasonable right" to confer with prosecutors (check), and to be informed of a plea bargain (check), but their rights end there.
2. And, victims' interests are only one of many factors fed prosecutors consider. Bottom line, "if you are a federal prosecutor, you represent the United States."
3. Quotes ex fed prosecutor Joyce Vance, who like most another attorneys who have gone on the record, believes it was a good plea deal, including because "hate crimes are difficult to prove at trial."
Last...that the plea was made public, including the MM's willingness to plead guilty, may well complicate the ability of the feds to conduct a fair trial (because, jury).