When people are in the grip of a moral panic, going up against them to question the extent of a threat, even by doubting so much as a single case, can become dangerous. Questioning any expression of the panic is not seen as a logical debate over statistics or the details of a particular instance, but as somehow defending the threatening behavior. Note how careful many people who wrote skeptically about the UVA case were to say that they believe campus rape happens, and it is terrible. People who write that they think an accused murderer may be innocent rarely feel compelled to affirm that yes, they sure do believe that murder happens, and boy, are they against that. This ought to go without saying, and unless we are in the middle of a moral panic, it usually does.