It happened to me and my team like 10 years ago or so: An engineer deleted the production database. We were able to recover it. But the postmortem basically focused on why the he heck did we let that happen. The guy stayed in the company for 8 years more IIRC. We fixed our systemic issue as well.

I've read about blameless postmortems from Medical professionals and I always tell my teams: if those guys (doctors) can do blameless PMs after someone has died, we can do them.