Then I suppose the cooling of the climate, large volcanic eruptions in India, and the asteroid were all just coincidences?
So which is it then? Volcanoes, ice age or a meteor. (You seem not to favour pandemic). If they all conspired together to kill the dinosaurs at once, then one would have to consider that a coincidence. Or a vengeful God, furious with the way dinosaurs were behaving.
The only other similar scale extinction of species recorded was due to a super-predator, us.
The Native Americans alone extincted ...
American Lion Panthera leo atrox, USA, Canada and Mexico, 10000 BC
American mastodon Mammut americanum, USA and Canada, 4080 BC
Ancient Bison Bison antiquus, USA, 8000 BC.
Beringian cave lion Panthera leo vereshchagini, Northern USA and Canada, 11000 BC.
California tapir Tapirus californicus, USA, 11000 BC.
Cuban ground sloth, Cuba, 5000 BC.
Columbian Mammoth Mammuthus columbi, USA and Mexico, 5800 BC.
Dire Wolf Canis dirus, USA, 8000 BC.
Florida giant beaver Castoroides leiseyorum, Florida, USA, 11000 BC.
Florida Short-faced Bear Tremarctos floridanus, USA, 8000 BC.
Giant Beaver Castoroides ohioensis, Great Lakes region, 11000 BC.
Giant hutia Elasmodontomys obliquus, Puerto Rico, 1000 BC.
Giant polar bear Ursus maritimus tyrannus, Arctic region.
Giant Short-faced Bear Arctodus simus, USA, 8000 BC.
Glyptotherium, USA, 8000 BC.
Hagerman horse Equus simplicidens, USA, 10000 BC.
Harlan's ground sloth Paramylodon harlani, USA and Mexico, 11000 BC.
Harlan's muskox or Woodland Muskox Bootherium bombifrons, USA, 9000 BC.
Harrington's mountain goat Oreamnos harringtoni, USA, 12000 10000 BC.
Imperial mammoth Mammuthus imperator, USA, 11000 BC.
Jefferson's ground sloth Megalonyx jeffersonii, USA and Canada, 10000-9000BC.
LeConte?s peccary Platygonus, ssp. USA, Canada and Mexico, 11000 BC.
Mountain Deer Navahoceros fricki USA, 10000 BC.
North American capybara Neochoerus pinckneyi, USA and Mexico, 11000 BC.
Pygmy Mammoth Mammuthus exilis, Channel Islands of California, USA, 10800-11300 BC.
Saber-tooth cat Smilodon fatalis and Smilodon populator, USA and South America, 8000 BC.
Saiga Antelope Saiga tatarica, USA and Canada, 11000 BC.
Shasta ground sloth Nothrotheriops, spp. USA, 11000 BC.
Scott's Horse Equus scotti, USA and Mexico, 11000 BC.
Shrub-ox Euceratherium collinum 9500 BC
Stag-moose Cervalces scotti, USA and Canada, 12000 BC.
Stilt-legged Llama Hemiauchenia macrocephala, USA and Mexico, 11000 BC.
Tar-pit pronghorn Capromeryx minor, USA and Mexico, 11000 BC.
Western Camel Camelops hesternus, USA and Mexico, 8000 BC.
Woolly Mammoth Mammuthus primigenius, Northern USA, 2000 BC.
Yukon Wild Horse Equus lambei, USA and Canada, 11000 BC.
Don't be fooled when they tell you that they are in harmony with nature.