You don't... but others do. Dinesh D'Souza has written a book detailing the "root causes" argument, but with a twist - the quotations and other evidence he amasses are from a socially conservative perspective. That is, he makes exactly the same, fully backed up "root causes" argument, but differs on the root causes in question.

Again, I am trying to make the point that what you find obvious isn't at all what others find obvious. People change radically across time and space.