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- Fridge Logic: The Zhirrzh rule over several races that previously 'attacked' them and keep them at a low technological level, with scientists occasionally studying their planets' ecosystems and having contact with them. So in all that time none of those races ever mentioned to them that radio isn't meant to be a weapon?
- Maybe they ended up slaughtering every member of each species who knew what radios were. We see that at least one of those species is completely subjugated and living barely-civilized lives, not allowed to gather...