All plagues have a cause. The current autism epidemic is caused by vaccination.
Is this so hard to believe? When you have the majority of the world believing that it came about by a Big Bang, that life evolved, and that there is no God, I can't see why Christians have a problem with believing that the thoughts of man's heart have become darkened.
A law that says you have to breathe oxygen doesn't cause autism is those who obey it.
Most of "modern medicine" is harmful. Sure, surgery, prescription drugs etc. all have their place, but they don't come without side effects, and sometimes, the cure is worse than the disease.