sure, lay it on me. What was Hitleresque about Babel?
Defining evil loosely as "opposed to God's will," then: God's stated will was for the human race to "Be fruitful and increase in number; fill the earth..." Genesis 1:28
He had a specific number of humans in mind to whom to offer salvation, and they were preventing their birth by their violence pre-Flood, so God had to start over. Once He did, the Tower, representing humans' self-will, continued that defiance: by remaining at Babel and refusing to "fill the earth" as ordered, again they were preventing, by their geographic proximity, the birth of the billions He planned.