No great shock that Wigan have decided to stick by him, just as it will be no great shock when he next implodes and screws up his next "last chance".
Personally I think Cas absolutely did the right thing with Hardaker and Wigan did their usual thing and took advantage of a situation. Without wishing ill on Hardaker himself I hope it does backfire spectacularly and ruins Wigan's season at some point (which historical evidence would suggest is the likely outcome)