What they really need is a facilitator to run a blameless postmortem for this incident.
It seems so unique, and it could be applied to many areas.
Here's Etsy's 2016 guide[1]. A bit old, but if it's been obsoleted by something, I'm not quickly finding it. Other suggestions? Its CareSets fork[2] saw a bit of work in 2020.
[1] https://codeascraft.com/2016/11/17/debriefing-facilitation-g... https://extfiles.etsy.com/DebriefingFacilitationGuide.pdf [2] https://github.com/CareSet/DebriefingFacilitationGuide_FromE...