There are many ways that irrational beliefs can kill. Every year people die from using alternative medicine rather than evidence-based, scientific medicine. Such people even if misguided or misinformed are generally only harming themselves. However, superstition can kill other people as well even those who are not involved. I'm not talking today about herd immunity and how not vaccinating endangers people who have been vaccinating. I'm talking about a far more horrific example, brutal murder to obtain talismans.
In Tanzania, as in a variety of other countries, there are beliefs that the body parts of albinos have magical properties and are good luck charms. Thus, people have taken to killing albinos and mutilating their bodies to obtain the wanted parts. Those albinos were in fact lucky; the unlucky albinos have had their legs and arms hacked off and been left to bleed to death.
Cectic made a graphic point about other species being driven to extinction due to human superstition. But we should realize that it doesn't just happen to other species, it happens to other humans. These murders are not that different from genocide; people of a specific type are being killed simply because of who they are. Let's not forget what happens when irrationally is allowed to run rampant: people die .