Pre Adamic race
If God had created and destroyed a pre-Adamic race why is it that God recreated another fallible race who followed in this same lifestyle. Listen to this passage in
Genesis 6:5-8 Then the Lord saw that the wickedness of man was great on the earth, and that every intent of the thoughts of his heart was only evil continually. The Lord was sorry that He had made man on the earth, and He was grieved in His heart. The Lord said, “I will blot out man whom I have created (for the second time, if what they say is true) from the face of the land, from man to animals to creeping things and to birds of the sky; for I am sorry that I have made them.” But Noah found favor in the eyes of the Lord.

Also one fact that I find interesting is that there were no nations recorded in scripture until after the flood and the tower of Babble.

Genesis 10:2-5, 8 The sons of Japheth were Gomer and Magog and Madai and Javan and Tubal and Meshech and Tiras. The sons of Gomer were Ashkenaz and Riphath and Togarmah. The sons of Javan were Elishah and Tarshish, Kittim and Dodanim. From these the coastlands of the nations were separated into their lands, every one according to his language, according to their families, into their nations. Now Cush became the father of Nimrod; he became a mighty one on the earth. Genesis 10:10-12 The beginning of his kingdom was Babel and Erech and Accad and Calneh, in the land of Shinar. From that land he went forth into Assyria, and built Nineveh and Rehoboth-Ir and Calah, and Resen between Nineveh and Calah; that is the great city. Genesis 10:32 These are the families of the sons of Noah, according to their genealogies, by their nations; and out of these the nations were separated on the earth after the flood.