Philosophers who study conspiracy theories have increasingly addressed the questions of where conspiracy theories come from, what such theories do, and what to do about them. This essay serves as a commentary on the answers to these questions offered by contributors to this special issue.

A great deal of conspiracy theory research presupposes a falsehood – that conspiracy theories as such are irrational to believe – and that conspiracy theorists as such suffer from a range of cognitive defects. But since people frequently conspire, many people believe in a wide range of conspiracy theories because they themselves are historically and politically literate. Thus, research questions like ‘Why Do People Believe in Conspiracy Theories?’ (with the presupposition that there is something wrong with them if they do) (...) are misconceived, since people believe in conspiracy theories (like many other theories) for a wide range of reasons, some good and some bad. But there are legitimate research questions here such as ‘Why do so many people believe in irrational conspiracy theories?’ But you can’t answer such questions systematically without a robust set of criteria for determining which kinds of conspiracy theories are irrational to believe and which are not. Furthermore, you need to keep the whole question in mind in conducting your research. If this were done, then it might very well turn out that people believe in irrational conspiracy theories for much the same reasons that they believe in irrational theories of other kinds (for example, religious theories). (shrink)