You said "Violence, corruption, wild orgies, murders, idol worshippers, rapists, rules who claimed to be gods, and any other evil behavior you can imagine was likely occurring when God commanded Noah to build the ark. What does God's word say the reason was for God destroying life on earth?"
And all of this has been going on for many years now, today! Has God changed His mind on this? Why has He done nothing on this? He must be changing His mind?
"Genesis 6:1 "And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, 2That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. 3And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years. 4There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown."
Yes! The fallen angels kidnapped and raped any human woman they wanted, married or single. The bred with these women and giants and other Nephil resulted....The offspring was NOT human....I'm sure you understand that? Notice that the Word says " "5 Adonai saw that the people on earth were very wicked, that all the imaginings of their hearts were always of evil only. 6 Adonai regretted that he had made humankind on the earth; it grieved his heart. " He said 'people', not 'man'. People includes angels...
"7 Adonai said, “I will wipe out humankind, whom I have created, from the whole earth; and not only human beings, but animals, creeping things and birds in the air; for I regret that I ever made them.”" Why did God regret that he had made man? 9 Here is the history of Noach. In his generation, Noach was a man righteous and wholehearted; Noach walked with God." Noah was perfect in his generations....what does that even mean? Generations= genetics...Noah was pure in his genetics...He was not polluted by angel DNA....He, and his family, totaling eight people, were fully human....They went onto the ark and the rest people and animals were polluted by angel DNA No longer human... Of course you already know that.....