Yes, bringing back extinct animals is morally debatable, but today scientists are trying to do this with species and subspecies in danger, and even years ago a read that they wanted to "revive" extinct animals, but was hard to find necessary DNA and/or animals that could breed them. In Jurassic Park, dinosaurs are hybrid because the DNA it's incomplete, it's a way to solve a problem, but in World they are trying to create new species from scratch, it's different to clone an extinct animal, that could be useful to study that animal in a recreated environment (It's not 100% identical, but it's better than trying to guess looking at today's animals) than to create a new species with certain qualities just because we can. And it's also different from choosing that goat and that goat because they produce the most milk, or the watermelon, which in past times had less food, or grain.
I didn't read the book, just saw the films, so I didn't knew that, interesting. And about the dinosaurs rights... if nowadays animals are treated like things in most places... it would be even harder to give dinosaurs rights, because they couldn't be released to nature.
I hope I have not committed many grammatical errors. XD