Socratism #fundie theologyweb.com
My own wild speculation, based only on ancient legends including those of Atlantis, is that genetic experiments had been conducted which essentially polluted the genomes of the entire human race, except for a few who like Noah were said to be 'perfect in their generations'. Thus, the necessity of a wholescale cleansing, including otherwise innocent children, and perhaps many animals as well. Perhaps someday we will find out the rest of the story.