The next step toward skynet

[Zouji]

war will always be a necessary event as long as humans are on the planet. its a way to keep the population in check, not unlike great plagues.

that and we can test/refine/research new weapons to prepare for the inevitable alien invasion

Or the great Zombie uprising (hey robots can't become Zombies!),
Or when cats learn to use tools and decide to kill us all.
Or when the great robot uprising occurs we need to have all the technology and robots we can get to battle the rising robot rebels. Hmmm maybe that last one isn't such a good idea. Never mind everything will be fine. That smoke you see is safety smoke. That means it's for your safety.