This man must be permanently stopped, anywhere in the world. And the donor system must be better regulated since he isn't, and won't be, the only one.
At the risk of sounding like victim blaming, however, sometimes some people can be a little shallow with looks - the most cliché form of beauty propagated endlessly by media - and they can be easily duped by cheap compliments. You could hear them talking how they might feel it's wrong or even disgusting at times, yet they went through with it because they're charmed. After learning what's transpired and that there could be intentional mixed-ups, two of the parents were even relieved that both their children got their DNAs from Mr. B&B whom they've selected from an online menu. I'm sure for them the decision to have a baby was made with utmost gravity, but the way some of them went about it - similar to that of marketplace online shopping - suggests otherwise.
The irony is that we might repeatedly teach our kids "it's the inside that counts," yet when we want to conceive, we might be obsessed with a certain type of beauty. This has to stop. After all, this is NOT the first time that our obsession with blond hair and blue eyes has brought us horrible chaos in the world - one very notable, terrible event that happened in the 20th century needs no reminder...