We all know that the media releases & such usually leave out a lot of the "behind the scenes" story. And quite often,, a lot of the "ugly" or "not PC" stuff is left out on purpose to avoid bad publicity.
Still,,, wolves are predators. And if they think they can get a meal,, they will try. Many wolf lovers will say it was just starving & needed food or help. They will want to offer more protections & whatever else they can dream up to try & "save the wolf!"
But it was most likely mother nature at work.
As noted above,, a lone wolf, likely old & out of a pack. Advanced age means that in it's "natural" environment, it would die slowly of starvation & fatigue. Or, possibly by a rival pack who found it in "their" territory. Mother nature in it's raw form is "cruel" by our human emotion standards.
Still, when animals are faced with hunting for food & hungry,, they can & will attack pets, humans etc. As humans if we want to survive, we have to stronger than the predator.
Or,, as most of us here would be,, better armed for protection.