If we cannot be kind to different races, how can we maintain the harmony between humans and extraterrestrial creatures?
It is undeniable that injuries which similar to our own situation or experience are more likely to arouse our empathy. By giving feedback on the electric shock to the users who is cutting a certain skin color. The device can correct potential injuries in advance, thereby making up for the lack of human empathy. What comes with the device is a brochure for aliens to read and guild them about what kind of appearance human prefer as mammals. Lead them to pretend to be children of mammals to avoid human persecution.