The answer is found in God’s commission for them to fill the earth. Earlier in Genesis (1:28), God gave his people the mandate to fill the earth, to show forth his presence throughout the earth. The problem with them building this city is they would rather stay within their homogeneous setting than have their lives intersect with others. Collectively and geographically, they turned inward. Rather than going in faith, they began to stay in pride. God saw the deep problems this way of life produces. They lived in fear of those who were different, so they created a tower. I read this as a bubble.
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