They'd love to understand why X works, but a whole lot of people could be treated by X while they spend all that time and money figuring it out. Besides, there

They'd love to understand why X works, but a whole lot of people could be treated by X while they spend all that time and money figuring it out. Besides, there's plenty of Y where they were sure it was going to work, it fit all the models and theories, it did the right thing in mice, and then in a trial Y fails catastrophically.