The dinosaurs made a big mistake. They should have put a carbon tax on those microbes.
How they can get into the mind of an extinct microbe is beyond me...how do they know it was humble? Its victims would be no more dead if the microbe was a proud microbe.
Actually this was the big event that enabled the dinosaurs to outcompete the well developed proto-mammalian Therapsids, most of whom died out at that time.
How do we know a huge meteor didn’t plow into Siberia, do its damage, and start the huge magma outpouring? Then a bacteria could have attacked the weakened life forms on earth. Perhaps it was more lethal to the therapsid branch than the dinosaur branch.