I didn't notice the article mention how many dogs.
Also unusual to have the owner so readily agree to have them euthanized.
Probably had a moment of clarity and realized how much trouble those dogs are.
Pit bulls are the breed of choice for thugs, "gangstas" and "Joe Dirts" and like over-sized necklaces and baggy pants, they are also coveted by the "wannabees" as a status symbol. A lot of young people get pit bulls because it is cool for them to say, "I have a pit bull!" and they don't know the first thing about keeping such a vicious animal.
I see this a lot with some of the young navy guys I work with who are out on their own for the first time. They'll keep these dogs cooped up in their apartments while they go to work for 10-12 hours a day and then act dumbfounded when their apartment is destroyed.