If somebody comes after you with one of these slaughterbots (currently still sci-fi, I believe), I'm guessing you are a high value target instead of... me. laugh If seems like we'll need counter-intelligence even just to know that we're a target, so we can deploy counter measures. By the time you see it coming, it's too late. So I'm willing to say don't worry about it.

Here's some more realistic threats. Home cleaning robots that have been modified in secret to provide, um, pleasure services. According to Ghost in the Shell 2, they can go berserk and kill their owners:

https://www.youtube.com/watch?v=0BKayvrTUe0

Or if you don't invite the Professional Russian to dinner, one of these quadrotors with a machine gun will come after you:

https://www.youtube.com/watch?v=SNPJMk2fgJU