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This is false, a gross oversimplification. Every organization has complexities, it doesn't reduce to a common idiocy. Even when the net result is idiotic in hindsight.
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Do you think all security engineers or whatever you want to call them are total incompetent idiots? If yes, I can't help you. If no, then you don't need further explanation from me.
Security requires a complex balancing act, and in this case they got it wrong, end of story. As stated elsewhere in this thread, there are only those who've been breached and those who don't know they've been. End of story.