It's a product of group think among the intellectual class, mostly on the East Coast, DC and Manhattan to be specific. Too many people trying to fit in and keep their jobs in a economy where the tradition media keeps downsizing because of the advertising dollars being sucked away into the internet. There are many other factors involved, but there is not space here to elaborated on them.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.