It seemed so reasonable!
What if I'm persuaded by him?
Birmingham and the others were filled with indecision, as most of their thoughts were contradictory; they were more willing to believe a stranger than themselves or their relatives.
Moreover,
The description of Duge included his skill in controlling people with words.
No one wanted to admit they had been brainwashed, as it would make them feel as if they had no opinion of their own.
"How can you prove what you're saying is true?" Birmingham stubbornly retorted.
"Birmingham, why do I need to prove it?" Duge looked at Birmingham and said with a smile, "If you feel controlled by me, you're free to leave at any time, go back to the Heavenly Gods Clan and be your warrior. Your thoughts, your body, are always free. I can continue cooperating with Raite and Cheson. Life's journey is long; along the way, some will join, others will leave, just stick to your choices without regret."