At the end of the Jurassic Park book they all agreed that because the dinosaurs were dangerous and had killed some people that the appropriate thing to do was for the army to come in and kill them all and burn everything.
I did not find that realistic. The island was isolated, and co-existing with dangerous animals is not new to human beings.
It was a bit ridiculous how no-one made a case at least for keeping the animals there to study, even if the idea of a zoo with the public visiting may not have been a good idea. Although I don't agree that the zoo concept was wrong anyway. If we can keep tigers in zoos we can keep dinosaurs.
The author was making some sort of anti-science anti-hubris argument about man playing God but I was not convinced.
I think if we can bring back extinct species we should.