Theoretical physicist Stephen Hawking has some advice for the people of Earth - it's time to get off. http://www.myfoxnepa.com/dpps/news/stephen-hawking-abandon-the-earth-dpgoha-20100809-fc_9088678
People with extreme experiences and conditions tend to have extreme view on things; their opinion have to be considered under the background.
he is not talking about NOW, but 100-200 years away: "Hawking suggests that if man can avoid disaster for the next two centuries "our species should be safe as we spread into space.""
You may be right. I think it will be a long, long time before we can go anywhere serious. Forget living on Mars.
Mankind is a cancer on all living things. The sooner it is excised the better off every other living creature will be.
I think you are right. But, if we ever are able to divert an extinction causing asteroid from hitting earth, we will possibly have made up for it.