Reason behind the story of dragons extinction

Dragons and humans co-existed on the planet all throughout history until over time the various dinosaurs/dragons went extinct. Many probably did as a result of the Ice Age right after the worldwide flood when both the climate and the world changed so drastically, and there was only one pair of each land kind to reproduce after the flood. Sea dinosaurs would have had many more survivors and probably took much longer to go extinct.
Some dinosaurs still existed in the 1500s as documented in scientific journals at the time, and much other literature and drawings of the time. The Loch Ness monsters, probably pleiosaurs, probably were alive well into the 1900s. There are newspapers photographs and news articles of a flying dinosaur who died in the early 1900s.
It is absurd to deny and censor out all the evidence of humans and dinosaurs existing. It is obvious they did. Human beings wrote stories about their encounters ALL over the world. They also drew pictures. There are stories of dinosaurs and humans existing in ALL ancient cultures. Sure, some are fictional. But the accurate pictures and descriptions, and in the scientific and other obviously nonfictional accounts, prove there were many real encounters.
As previously mentioned, we have photographs of the most recent ones. And scientific journals of the 1500s with descriptions of the living animals at the time, where they lived, what they ate…
The Bible describes some kinds in Job, which is probably the most ancient book of the Bible, though of course SOME of Genesis predates it.
The Catholic Bible even has a book entitled “Bel and the Dragon”.
To this day, England still has a picture of “George and the Dragon” on their coins. Many churches are still named after St. George, who was famous for slaying dragons.
Cities in Europe were named after Christian saints who were able to slay dragons “in the name of Jesus”. Dragon slaying was one of the reasons Europe went from pagan to Christian as many people witnesses first-hand that Christian saints could slay dragons “in the name of Jesus” whereas no one else could. Farmers and villages were saved from the terrorism and destruction of dragons/dinosaurs.
Komodo dragons still exist. Look them up.