Even though Jacdo and his people had acted quite normally during this period, looking quite harmless, their massive amounts of negative faith energy told Ali and James that they were not good people.
If they were allowed to stay here in this town, their true natures would be exposed sooner or later, causing harm to this town.
This was exactly what Ali and James did not want.
If it was under normal circumstances, they would keep an eye on Jacdo and the others and keep them in check.
However, they had no choice but to leave under these circumstances.
The hero's trial was something that the hero could not do without.
The hero was the key figure to defeating the demon king and ending this demon disaster.
If the demon king was not defeated, the demon disaster would not end, and the world would remain in danger.
Whether they became the hero or watched someone else become the hero, they still had to go and participate.