We are very, very strong monkey tribe. Join us, can’t you taste the power?

I interpreted that paragraph about being more, "Come. We show tree with young of third tribe. We show how raid third tribe for meat. Gift to you! No obligation join our tribe in fight," after reading:

And at the risk of sounding like a James Bond villain, there are some serious options for us to take over the world here. In the sense at least that the Occupy movements' goal is lasting societal change, and they have a good deal of momentum already. If members of the rationalist community moved to help them, they might have a fair deal more. And if we introduce them to rational ways of thinking, if we inject those memes into the discussion, there's some serious opportunity here to help stop the world being so insane.

That last quote is the "We strong, join" one.