This Scripture passage explains why God had to judge the people at the time Noah was living. God had to judge the people of that time because the sons of God had united with the daughters of men, after having seen their beauty. God gives a plain and easy explanation for the judgment of people, which even a 1st grade elementary student could understand without any trouble.

https://www.bjnewlife.org/ 
https://youtube.com/@TheNewLifeMission 
https://www.facebook.com/shin.john.35