It's not even the going ballistic part that gets me, but the sequence of events. Management refused to allocate the time to fix tech debt/bugs, this decision comes back to bite them in the ass, GP takes the typical tack that tries to deflect blame away from shitty management decisions.

"Could you, the devs, have fixed this bug under severe time pressure just before a critical sales period instead of when you first identified it?" -> if yes, no problem. Spiritus sancti, management is absolved of their sins.