How does a species at the top of the food chain just go extinct? It defies all logic, never happens in nature. If you believe the space rock theory then you need to believe it wiped out every last dinosaur in every corner of the earth yet everything else survived. Do you know how dumb that sounds? Makes more sense that they went extinct because of another species superior to them, which is always the case in nature.
Real answer: Reptilians. Sentient dinosaur descendants that walked on two legs, used tools, and later had civilisations. Considering the dinosaurs 'went extinct' 66 million years ago, homo sapiens didn't appear until 350,000 years ago and writing wasn't invented until 5,000 years ago, I'd say the reptilians had plenty of time (66 million years at least) to become more advanced than anything we can comprehend.
Again, humans didn't learn writing until 5,000 years ago and look what we have accomplished in 5,000 years. Imagine a sentient civilised species having 66 million years. Most likely explanation is we were genetically engineered by them and they're ruling us in plain sight like cattle, like one big resource. Most likely all of the royals & elites over the last few thousand years are all reptilian. David Icke was right.