I find it unfortunate that Schneier chose to underline the XZ maintainer’s mental health issues (literally—he linkified it) as the reason he’d slowed down on the project, which then led to being open to taking on the malicious co-maintainer. Schneier then follows that linkified fact up immediately with a parenthetical that Collin isn’t to blame. But then why call out that very potentially stigmatic thing at all, with…
Because the attackers successfully exploited it. And therefore it's something we need to prevent from happening again. The problem is there isn't an easy technical solution, this is is a social/medical issue that they exploited.
Slowdowns happen for all kinds of reasons. Life comes first. The explanation behind the slowdown wasn’t relevant here or a factor in the attack. They exploited the growing need for a co-maintainer. Airing the dude’s medical issues, particularly out of context to an unintended audience, isn’t awesome.