That’s not true. Wolves are incredibly smart animals and will find and exploit weak points in otherwise expensive fencing systems. They also jump surprisingly high. Moreover, once they manage to cross a fence they do not kill to feed. Instead, they slaughter entire herds of sheep for the sport of it. I personally think wolves are incredible animals, but their sudden reintroduction in the Netherlands feels ill thought out.

Hmm. Well, not sure about this. If you put yourself in the shoes of the wolf, sheep are abundant, free, delicious everything- their "economy" is exclusively food-bound. Not sure what kind of fences would keep them out, and how expensive would they be- and how long they would last.