Heck when you put it that way, this guy actually did them a FAVOR. He ONLY wiped out the User table. The company was able to learn the value of backups, and they had enough data left to be able to partially recover it from the remaining tables, which is much better than the worst case scenario.
Do you think the company learned the value of backups, or do you think they learned to blame junior devs for fuckups? Sounds like they learned nothing, because no attempt was made to determine the root cause.