Genesis 11: 1-9; Scattered!

Genesis 11: 1-9; Scattered!: "Finally, in Gen. 11, God also decides to punish humans, though it isn't as clear what the offense of Gen. 11 is (the building itself? the arrogance of humans? the unwillingness to 'fill the earth' according to the command in Gen. 1? the use of poor materials to build a monumental structure?)."

In any one of these, are we less guilty today? Why hasn't God come down and intervened? If a clay tower could upset him, how about an atomic bomb?