“If the planet went wrong, they would want to wipe it clean. But that could t
ake 500 years. When they revisit – because different visitors would come bac
k and see we’re not doing so well – they would look at these human beings th
at are jerks, that are killing the planet, killing themselves, can’t settle d
own, they’re like a bunch of children. We should wipe it clean.”
节录来源网站的内容：
工程师本身就会在宇宙间散播生命，但是当这些生命体变糟糕时（破坏星球、变成一群混
蛋），工程师会选择用黑水清空星球，也是大卫所说的“杀掉除了植物外的生物”。
雷导也谈论大卫之所以要清光工程师的原因：
"He hates them. He has no respect for Engineers and no respect for human being
s."
原文网站：
http://www.avpgalaxy.net/2017/05/24/ridley-scott-explains-engineers-wanted-kil
l-mankind-davids-motives/
备注：如果解释成大卫痛恨这些种族的原因是因为这两个种族都害怕他们创造的生命能逾
越创造者本身的能力，且不尊重其创造的生命体。那就不难了解为什么大卫想创造异形。