it's not impossible that admin just forgot to tag the illustrator's name though, it happens to several other mangas that have a co-work, be that or maybe the author's drawing style is familiar to you because it's almost similar to other author's work or perhaps it's actually the same author just have a different tagged name (like spelling or anything like that)
It's easy to hate the village and its chief, but honestly they were all screwed and he didn't feel he had any choice. The villagers didn't have the power to oppose the cult and especially not the dragon, and the enemy knew they were sheltering the elves. There was nothing he could do to save them, and his own family and people were being directly threatened to secure his cooperation. If he warned them and told them to run, his village and people would be destroyed and slaughtered. The elves would probably die anyway, and even if not it's too much to ask the people to sacrifice their lives to save strangers. You can't blame people for doing what they're forced to under threat of death.
The fact that they took in the elves in the first place, offering them shelter and food and welcoming them with kindness, proves they were basically good and kind and decent people. They were forced to cooperate with the evil cultists and their dragon enforcer under pain of death, desperately hoping that they could survive. Chances are, they would have been slaughtered anyway because evil doesn't keep its bargains but you can't blame them for surrendering and doing what they were told in the face of overwhelming force.