It's a very sensitive case, because we all love animals and want them to be treated as good as possible. But nevertheless, we kill thousands of animals every day just to get meat on the table. In this case it was a matter of inbreeding and the zoo needed to get a new male lion for the two young females. They tried to find another zoo for the two old ones, but that was not possible, and the two cubs would have been killed anyway by the new male if they had stayed. Yes, it's sad, but I think the zoo acted responsible nevertheless. Most other zoos do the same, but you just don't read about it in the papers.