I live in a apartment building in China and can see 1~3 Periplaneta americanas or Periplaneta australasiaes when I turn on the lights during midnight. Though they are considered as pests, I don't kill them when I see them. I love Periplaneta very much. Just my parents, they hate cockroaches very much and kill them every time when they see them. My parents always think that cockroaches are worth dying because of their pest identity. So I can't prevent my parents from killing them.