There are various reasons put across for the reasons the dinosaurs are extinct but I have the right answer. ALIENS. Why you ask, do I believe the aliens did it? Easy, Transformers 4. If you have watched the latest installment of transformers you will understand me. At the beginning, you see Lockdown’s ship throwing bombs which kill the dinosaurs. Meteorite my a$$. That was just another cover up by the government to make us think aliens aren’t real.