The story marvels how the people could build such tall structures from rock and mortar. This was marvel, as locally, they were stuck with bitumen. So the tower itself was being marveled by the storyteller and audience. Holy fuck! A tall stone structure?! Fucking awesome!
As with most stories, this one is trying to answer why something sucks and why it isn't necessarily god's fault because while Yahweh was one tough mutherfucker, usually when shit went down, he was punishing his people, not torturing them.
So why are there so many languages from one group of people? Tall tower, god freaks out, god overreacts, but it was man's fault because they wanted to become godly. The fuckers!
So my review of the story takes it down the road. The story opens saying mankind is kicking butt! So much so they are doing great things together, as one. I mean wasn't that the whole fucking point of Cain and Abel and putting the mark on Cain to prevent the other people (who didn't exist yet, but actually did... did JJ Abrams write that story?) from killing him too? Mankind was pushing forward and becoming great!
God shakes his head, says this has to stop. And ultimately divides man and we know this division is a major source of the warring between man. So the question posed is why isn't God held responsible here. The people who composed the story suggested that man was trying to become gods. So to stop them, he divides man. Seems a bit extreme and definitely leading to mankind being at each other's throats.