There are gradients of evil. The kind of evil exhibited pre-Flood is obviously different from that exhibited by modern man is my point.
Many Biblical scholars (Michael Heiser being the one who stands out) point back to Genesis 6 as the source of that particular evil.
BTW, there is more to the event--Babel--that just what is presented in the Hebrew Bible. There are many ancient literary/mythic sources from which to triangulate this story. The Sumerian/Mesopotamian sources shed light on this event--albeit from an entirely different POV.
What goes up must come down. That’s why democrats were invented and sent to public schools.
Probably and apparently not for much longer.