Appeal to fear (also called argumentum ad metam or argumentum in terrorem)

[Wikipedia] An appeal to fear

[Vaccine diseases are dangerous (See: Benefits Outweigh the Risks) is a medical industry Rationalization.  It is also used for fearmongering. No one is doubting that children have died from measles, smallpox etc, but they leave out 99% of the story to make vaccines look good.]

Examples of what they leave out
measles more to be dreaded than smallpox'  Dangers of smallpox Case mortalityHype Disease risk

Here and see what happens when a child whoops with pertussis":

Not everyone recognizes measles as the serious disease it really is, possibly because it used to be a routine part of everyone's childhood, and also because we don't see it nearly as much as we used to. But measles can be deadly. The 10th Century Persian physician Rhazes considered measles "more to be dreaded than smallpox." Measles still kills about a million people a year around the world. Measles can also make a pregnant woman have a miscarriage or give birth prematurely......It can lead to ear infection, pneumonia, seizures (jerking and staring), brain damage, and death   AAP