It's like:
Bozo is a famous surgeon. He generally has good luck with the complex cases. But, there was this time that an infection took hold in one of his patients. Oh well, it happens; it wasn't even that serious. But, then it was discovered that Bozo doesn't always bother washing his hands before operating. Well, the infection was treated and cured, so you might be tempted to overlook it. But, you can never unlearn that the cause of that simple, easily curable infection was Bozo's extreme negligence.
It's not enough that Bozo maintain a reasonable track record with his patients. He has to convince us that he's learned to wash his hands. If not, you just know that infections will keep happening.
We see Apple's incompetence in plain display with this bug. That incompetence will cause minor bugs, major bugs, and everything in between. The first order of business is not to fix the bugs; it's to fix the incompetence.