Honestly he seems less at fault than his new company is.
He fucked up royally, but he shouldn't have had that much authority in the system in the first place.
He did a huge mistake on his first day, okay...but why has nobody given him a proper workplace environment ?
No back-up ? Nobody reviewed the newby work first ? Imagine if instead of being a mistake it was someone with bad intention ?
FFS, I don't work in IT, but I run structure calculation for industrial building among other things. When I approve something, there are at LEAST five people signing it after me and two re-reading my version/commentary, so that nobody misses anything.
On the other hand, Nasa-kun is OP as heck.