Gong Chaoqun simply couldn't find a reason not to accept this grand gesture.
He wasn't required to rack his brain solving cases in his official capacity, allowing him to wrap things up easily and make a good account of himself to both the court and the public—this tale was too perfect and of the kind that the masses were eager to accept.
In terms of the situation, although it might not significantly impact the entire Maitreya Sect, it could at least contain the situation in Yangzhou. Otherwise, with the Magistrate and the Cao Gang riddled with Maitreya followers, Gong Chaoqun was genuinely worried that by the time he woke up the next day, Yangzhou would have changed its allegiance, and his own head would be cut off to adorn the flag.
In terms of justice, killing barbarians was a righteous act.