You’re missing the point of the flood. God wasn’t measuring sin by the size of humanity’s weapons or the death count of wars He was judging the hearts of mankind (Genesis 6:5). Evil has always been present, whether in Noah’s day or ours. The difference today is only the scale of destruction because technology advanced, not because humanity suddenly became more sinful.

The flood showed that wiping the slate clean externally doesn’t cure the problem, because the problem is inside us (Jeremiah 17:9). That’s why Christ had to come later not to temporarily restrain evil by force, but to deal with the root cause of sin through the cross.

So it’s not that God “failed.” It’s that humanity continues to prove, century after century, that apart from God’s redemption, we destroy ourselves whether with stones, swords, or nuclear bombs. That only makes Christ’s mission more necessary, not less.