But as always in The Walking Dead, the biggest threats come from other people, not from the walkers. There is a huge difference between Rick and his people and the Alexandrians. They never had to survive, they stayed in their houses and they were safe thanks to the walls whereas Rick and his people went through hell to survive. The conflict between their different visions of the new world escalated quickly last season and led to a shocking scene in the finale where Morgan finally arrived in Alexandria, to see Rick executed Pete in front of everyone.