All of that, in turn, made Daryl go out to try and take out Alpha by himself, leading to him getting stabbed a bunch.
The trickle effect, meanwhile, lead to Beta infiltrating Alexandria and killing a bunch of its residents in order to cause a walker infestation within the walls.
After all, it was Carol’s impulsive actions that caused Connie and Magna to get separated from the main group in the first place – although everyone was having a hard time staying together down there – and Carol fully blamed herself for it, and tearfully begged Daryl to join in that blame game.