Ken, #1115, whist agreeing with the sentiment of your post, there is as yet no public evidence of the authorities’ knowledge.
It would be very surprising that there was none; however it is more important to understand their process of approval, the depth of knowledge, assessment, and validation of safety cases.
Something slipped through the net; the safety process appears to have failed us. This is a key aspect of our trust in the airworthiness of the aircraft we fly, hence the strength of the operational concern.