How did you come to that conclusion?
The Bible
Not, unable.
He'd decided, not to.
Hmmm, is that so? He couldn't even destroy Adam and start over after he disobeyed. Why" Cause he was necessary. Otherwise, one could start over. He couldn't drown everyone either, he had to leave some humans alive. He even had to let Lot live as well, despite him offering his daughters to be raped by a gang of villagers. Not once could he ever completely destroy humanity.
I don't know what Bible you've been studying - if you'd studied it at all - but this explains the incident at Babel.
Yes, I know. I went to Catholic School, we read the bible often.
4 And they said, “Come, let us build ourselves a city, and a tower whose top is in the heavens; let us make a name for ourselves, lest we be scattered abroad over the face of the whole earth.”
5 But the Lord came down to see the city and the tower which the sons of men had built.
6 And the Lord said, “Indeed the people are one and they all have one language, and this is what they begin to do; now nothing that they propose to do will be withheld from them.
7 Come, let Us go down and there confuse their language, that they may not understand one another’s speech.”
8 So the Lord scattered them abroad from there over the face of all the earth, and they ceased building the city.
9 Therefore its name is called Babel, because there the Lord confused the language of all the earth; and from there the Lord scattered them abroad over the face of all the earth.
—Genesis 11:4–9[1]
So what does god say? He doesn't say that he's mad because they didn't procreate enough, he says
“Indeed the people are one and they all have one language, and this is what they begin to do; now nothing that they propose to do will be withheld from them."
Humans have one language, and with it they began to build this city of their dreams. Nothing humans want to do is out of reach.
That's why he confused the languages and scattered men, because united Humanity can do anything. Ultimately, your god fears mankind, but is wholly dependent upon us. He can never destroy us in full, but has to make it so we cannot work together because if we ever do, we can do anything.