"But all three women said they were told by prison medical providers they were being induced because it was a policy of the Arizona Department of Corrections for all pregnant incarcerated women, not due to their individual conditions."
Risk by itself is enough and there is no such thing as a medical procedure without risk. Induced delivery is fine if and only if it improves the chances of mother and baby, even if in the end everything goes fine. Utilitarian arguments and ethics don't mix.
The article says a healthcare specialist recommended that course of action.