There was always bad code. Extend that to the general challenge of a bad hire doing net-negative things for the company. AI is a new problem because it 1000x a bad hire's blast radius. Personally, I'd even state that AI tends to turn an average and sometimes-but-not-always-good hire into bad hires because finally they get to do the thing they've always wanted at lightning speed in a way that previously the company red-tape wouldn't allow.