In what way God acts is beyond my ability to discern. So I leave it to Him !
Some of those in your concerned group, perhaps you never imagined that it could be he or she, would all of a sudden begin arguing or working against implementing the good work. A negative force appears in the scene from nowhere to oppose a decision favouring a good work.
If you are stubborn to some issue even without your own logical mind could reason out, then possibly you should doubt satanic invasion of your mind. Knowingly or unknowingly your mind is 'invaded'.
Deceptive ways of Satan will work only when you allow such a thing to happen !
Unfortunately for those who have fallen to such deceptions, it is not very easy to come out of it.
Because their minds are filled with pride and ego, another all pervading 'gift' from the forces opposing God. A gift that makes their minds not yielding to the corrective tools that God has so gracefully provided to them!