They came back 32.785 million years later on their regularly scheduled rounds only to find that LOCAL FAUNA had taken over and eaten all their hadrasaurs. They got so upset they nuked half the new animals.
[ Alternatively the fellows who kept track of the dinosaur parks on Earth came around to do a survey and found all their animals had been killed ~ so, being good stewards, they brought in some newbies!
They came back 32.785 million years later on their regularly scheduled rounds only to find that LOCAL FAUNA had taken over and eaten all their hadrasaurs. They got so upset they nuked half the new animals. ]
Nah, we invent time machines and an apettite for dino burgers and we rationalize it by saying we can only kill dinos for meat as long as it is after the K-T event....