This discussion may contain spoilers!
I made a thread way back explaining how Wellington is a trap, and like Terminus Sanctuary. Everyone doubted me, and down-voted. Now I have proof to finally back up my theory.
Wellington is not what people think it is. Hunters, and walker reside there. And there's no such thing as repeating what's already happened in a ZA. Yes we already witness cannibalism at the St. John's, but Wellington is much worse. I think your decision from season 1 to make Clem eat Mark plays a role in the finally. People at Wellington will force Clem, and whoever is with her to eat walker meat. Clem will remember Lee, and avoid eating it causing someone to get shot. Depending if Clem ate Mark I think she would say, There was this farm my group, and I went to. They killed a guy named Mark, and made us eat him. I asked Lee if I'd turn into one of those things, and he said no.
So here's why Wellington is like Terminus Sanctuary. Look at 205's trophies:
Wellington's motto to lure people in:
Welcome to Wellington. All who arrive survive. We have plenty of fresh water, and people of all ages here. The walkers are pretty slow due to the winter. So what are you waiting for, come to the Wellington Terminus, and earn your sanctuary now...