"A disease came out of Africa, a cancer of the earh - and that cancer is us. Humanity. You have to face it, people are a bad idea, period. We replicate out of control. We consume resources needed by other parts of the ecosystem. Eventually we'll destroy it. We shouldn't exist! We should never have existed!"
"We all have to be Daleks sometimes," he muttered, looking down at his mud-caked shoes. "It's just a matter of knowing when you really don't have any choice."