According to science, flying cockroaches merely consist of molecules and atoms that people do, theoretically, we are flying cockroaches, just assembled in a different form. Second, flying cockroaches make people scared, because of one organ, the brain, the brain simply interprets to you that you are scared of a flying cockroach, most and maybe all animals do not even care about a flying cockroach because their brain is not as efficient or just because they don’t care about hygiene. Third, people developed fear of some insects and other animals because of hygiene, people’s teeth only get dirty because of the food they consume, the sugar you eat that get stuck on your teeth get eaten by bacteria, slightly damaging you teeth. Third, it is not worth it, to trade valuables and personal belongings to defeat a few specific specimens of invertebrate animals, you could just use a bug spray, but if not, accept it, trading all you things is not worth it.