Hello.
Jehovah witnesses teaches that Adam d ecided autonomous sovereignty and God choose let time elapse for demonstrate whether government is better: human government or divine government, allowing many suffering and blood in thousand years.
But, the human government received an intervention of God when He confused the languages at Babel. This shows that God really does not let humans govern themselves. Since Babel language confusion the human government is not the government that Adam decided for all mankind, because human government was hit by God.
So if God has intervened in human governation, really he not let man shows all capacity in gobernation, when the man would reach a milestone in Babel, God conspired against them. Then, someone can says that Babel went against the purpose of God and therefore not allowed . But the suffering was not God's purpose and God has allowed. Then, really God not left humans to govern alone, because he conspired against them in Babel. God not allow full expression of human governation in Babel, but allow the suffering thousand of years.
My conclusion, really God not left to humans govern alone (since Babel, human governation decided by Adam is no the same, because language pitfall problem was caused by God). God no allow succesful in Babel, but allow the suffering thousand of years. Sorry for my english.