I mean no such claim. One does not have to be an idiot or irresponsible to overlook an unintended consequence of some code change in a very large, legacy code base.
If that claim were even reasonable in the first place you would have to accept that they were idiots long before by allowing bugs to be introduced in the first place.
The presence or introduction of bugs in software does not mean it’s developers are ‘idiots’ unless practically everyone who has ever written code is an ‘idiot’
