TT #79 · Parashas Noach · Seventh Aliyah · Passuk 11:4
Lest we be scattered over the face of the whole earth.
Torah Temimah notes the irony that the very outcome they feared was imposed upon them.
“Lest we be scattered” — and in the end they were scattered.
Custom (measure-for-measure outcome).
The fear that motivated the building became the precise punishment that was executed.