Chimpanzees certainly don't engage in warfare, unless you want to anthropomorphic chimpanzees and change the nomenclature of warfare.
While chimpanzees certainly hit each other, they have not been observed much to kill one another, unless humans artificially modify their feeding environments and territories.
As I said, "they have not been observed much to kill one another, unless humans artificially modify their feeding environments and territories". You linked to a page with a large picture at the top of a feeding station where "humans artificially modify their feeding environments and territories".
More like chimpanzees by nature preceded humanity. We are mostly likely some derivative of them through some sort of eugenic (natural or not its unknown) process that helped us gain consciousness of the highest degree.
It's likely that certain pharmacological byproduct consumed shaped and formed our awareness, the same way alcohol and tobacco have produced our modern male dominated society.
Think about this. A chimpanzee encounters a strange mushroom, consumes it, suddenly begins to attain visual acuity which allows him more information gathering about the surroundings. Not to mention conceptualization, abstraction all of which are basic building blocks of human consciousness.
We might be a decendant of group of primates that successfully mastered fire manipulation. Cooked meat has far more nutrients and proteins that further help develop ouir brain.
Just running on bits and pieces I read here and there and its fun to entertain the thought of how we emerged as a dominant species. I'm under the school of thought that there was some informational/knowledge transfer that radically set us apart from the rest. Emergence of consciousness and our continued expansion of our awareness seems very much real.
While chimpanzees certainly hit each other, they have not been observed much to kill one another, unless humans artificially modify their feeding environments and territories.