If LEO is involved, they wouldn't be disclosing evidence to avoid the public interacting with suspects or possibly leapfrogging them and tipping off someone new.
In this case the public would benefit from knowing quickly who are the bad actors and what other projects they touched.
Can we not dogpile Lasse after his vacation was ruined by this. He has much bigger concerns right now than trying to export and sanitize his entire communication history with Jia.
I have a lot of respect for xz's original author, I just didn't think about the legal stuff, and that sounds quite reasonable to me now.
Personally, I find it hard to subscribe to certain theories, such as the possibility of Lasse being impersonated or involved in the incident. But that doesn't mean we should dismiss them outright at this stage. (And I'm sorry if you don't like to hear that, saying this is not comfortable for me either).
In this case the public would benefit from knowing quickly who are the bad actors and what other projects they touched.