Dalrymple examines arguments against the anti-rotavirus vaccine:

…on the balance of probability, immunization against rotavirus does cause intussusception in infants and is therefore not entirely harmless. To that extent the conspiracy theorists are correct. But good in medicine seldom comes without the possibility of harm (the reverse, alas, is not true), and if doctors never prescribed anything that might do harm as well as good they would not prescribe anything at all. The good must always be weighed against the harm and in this case the balance seems overwhelmingly on the side of the good.