In general, I think the average human being provides some good for the world. If nothing else, the average person in most[1] of the world can vote, hopefully on average stabilizing the political system. [2] They also act as an allocator for the market, enabling capital to go where needed. Each actor in the market acts as part of Adam Smith's invisible hand, helping decide where resources go. At the same time, most are parents to children enabling the whole thing to happen again.

Is your belief based on human impact on the environment, or is it something else?

[1] Better resources a Google away but this is something at least. http://www.economist.com/node/8908438 [2] http://www.stier.net/writing/demstab/demstab.htm#_Toc5203975...

I think you just have a negative view of humanity.