I think this guy from the article has the best take:

Marsden has handled dogs since the age of seven, and following a long career as a stockman in agriculture, has spent most of his life around working dogs, training collies, lurchers and greyhounds. “I think there is a growing problem now with owners not taking responsibility for their dog’s actions,” he says.

“Not everyone understands how to train them properly.”

He says there have been similar concerns about potentially dangerous breeds over the years, such as rottweilers and dobermans, and that banning a breed may only shift attention on to a new one. “You take these off people and the likelihood is they’ll just move on to something else.”

What’s the alternative? “We need to look at getting more licensed breeding, so there is more oversight into where these puppies are coming from ... People are bringing dogs in from other countries where regulations aren’t the same as they are in the UK.”