Strictly speaking, Yang Ning and Li Hu did nothing wrong.
Perhaps they had private motives for executing the deceit and used Luo Ming and the other four leaders as bait too harshly, but staying at Redwood Ridge to help them deal with the Wood Puppet Monster is an undeniable fact.
Even in the recent great battle in the valley, the roles played by Yang and Li were crucial.
Good deeds should be judged by actions, not intent.
No matter their motives, the fact is they helped.
Their mistake was their arrogant attitude from start to finish.
Four failed attempts to eliminate the deceit had long worn out everyone's trust. After all, in these four attempts, Yang and Li only exerted force, while Luo Ming and the other four leaders gave their own lives.
Though needing their help, everyone chose to ignore their arrogance and occasional disdain, but this didn't mean they had no thoughts; they only endured because they sought help.