11 The earth also was corrupt before God, and the earth was filled with violence.
12 And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth.
13 And God said unto Noah, The end of all flesh is come before me; for the earth is filled with violence through them; and, behold, I will destroy them with the earth.
In these verses we get a little insight as to what was wrong with humanity at this point: they were filled with violence. Flesh had corrupted itself to the point of destroying itself! What a strange and horrifying phenomenon this is in humanity: that we reach the point of self destruction.
We do this on an individual basis, when we intentionally do the very things that we know will cause us harm, sometimes to the most extreme degree of taking our own life! We also destroy ourselves on a global basis, with the genocide of entire societies and the threat of mutually assured destruction.
These behaviors are the final and great insanity! What other form of life is there that intentionally destroys itself? In fact, as I’ve awoken to the state of my own soul, I’ve spent far less time praying to be saved from others, and far more praying to be saved from myself!