"uncontacted tribes will have seen aeroplanes on numerous occasions. The idea that this damages their self-image and/or spiritual beliefs belongs in the realm of fiction, and is based on the false supposition that their cultures are fragile. Experience shows that such peoples are in fact robust and well able to adapt to outside goods – most have been doing so for a very long time. Tribal peoples are not destroyed when they get or see things from outside, but by violence and disease as their lands are invaded."