It's fascinating to read this discussion and compare it with other incidents that have been commented on in this forum, like the 747 with an engine shutdown out of LAX that continued on towards its destination. In that case the crew performed actions that were approved by the aircraft manufacturer, the operator and its regulatory authority and yet came under some intense criticism.
In this one, we have a crew in direct contravention of the airline's SOPs, the regulator's instructions and the manufacturer's manuals but they are still getting quite a bit of support from various quarters on here.
The rules surrounding wing contamination are very strict because it is a literal matter of life-and-death. This crew were very lucky to get away with what has been described... the accident records show this to be true.