Cockroaches are insects of the order Blattaria or Blattodea, of which about 30 Species out of 4,500 total are associated with human habitats. About four species are well known as pests. (Source: Wikipedia) So only 30 species out of 4,500 are associated with human habitats, and out of the 30 species, only 4 of them are pests! Just because of these four pest species, there's really no reason to