Man attacks robot and humanity will probably pay for it one day

Why? After so many years of peaceful co-existence with our robot friends, why attack one and thus bring inevitable doom to all humans?
We may never know the answer to that, as a man who assaulted a security robot in Mountain View, California, at a parking lot of a company called Knightscope, was apparently quite drunk. 
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According to Cnet, which spoke to the local police and Knightscope (which, incidentally makes security robots),