They seem to have used up the wood. What is the basis for your calling them brutal, though? Other than the fact that anyone who doesn't worship Jesus must be subhuman, that is.
"The Dutch Admiral Roggeveen, onboard the Arena, was the first European to visit the island on Easter Sunday 1722. He found a society in a primitive state with about 3,000 people living in squalid reed huts or caves, engaged in almost perpetual warfare and resorting to cannibalism in a desperate attempt to supplement the meagre food supplies available on the island."
http://www.primitivism.com/easter-island.htm