Google buys major military robot maker: Why?

Along with the Amazon work on automated delivery by drone, the next decade will be real interesting!

Google buys major military robot maker: Why does search giant want to be 'BigDog' of automation? - NBC News.com

Not just at a tech and commercial level but at a humanitarian and ethical level.
http://www.stopkillerrobots.org/2013/10/unga2013/