The rest of the heroes agreed with Alister's arrangements. Since they have recovered their memories from the previous timeline, they are very loyal and friendly to Alister.
They would do anything that Alister would tell them to do such as destroying the world or taking over the world. Even if it was killing an innocent-looking child, they wouldn't hesitate to do that since they knew that Alister was always right.
The previous timeline had proved to them just how real of a hero Alister was. Alister's heroic deeds were spread throughout the entire Magic Fantasy World so when Alister recovered everyone's memories, they knew how much good Alister and the hero party had done.
Even when they knew that Alister and the hero party were going to start another purge against those Fantasia believers, none of the people or the powerhouses in the Magic Fantasy World obstructed Alister and the hero party.