The "disabled" message is purely to let you know that a piece of the machine was destroyed and it has been effectively taken out for which you get points and your security level goes up. (Hitting the same machine again, or blowing the whole thing up, will have no further effect.) There is no affect beyond the machines themselves, except for those that explode, of course.
As for sabotage, it only targets machines (where are you getting the idea that it targets a robot?). jimmijamjams or biomatter figured it out at some point, I think, (or I told them?) but I'll not mention it here. You'll learn more about that in Alpha 5 or so. But... your comment about the sabotage affecting robots gave me a pretty awesome idea for a new hack.