Let me answer your question with a question:
Why is it common, everyday practice in hospitals all over this country to not only use Pitocin to induce childbirth, but to actively try to talk the patient into its use, even after they voice their objections?
The FDA removed its approval of the use of Pitocin in 1978. Pitocin is still being created by drug companies. The AMA is still preaching its everyday use. The hospitals are still using it...heavily.
Now apply your logic, and explain this situation to me. I can't. I'd be willing to bet that it all comes back to the almighty dollar.