Geez, sometimes you can be really harsh. My point is, Disney has characters in costumes running all around, and will presumably have some in Star Wars Land as well. Guests including small children are encouraged to physically interact with these characters. Now here comes a robotic character. Children aren't going to see these as any different that characters in costumes. Given that you said children could be done "serious damage" by these robots "in a second," presumably you expect the parents to prevent their children from ever touching the robots, not just stop them after they see them do it. I think that's unrealistic. Furthermore, I don't think not grabbing a child before they touch the robot makes someone "stupid," or dumber than a gnat. I'm not even sure why it should be common sense that a child-sized robot that rolls around in the midst of children should not be touched. Or why parents should be considering Disney's liability situation when they are just walking from point A to B and a character pops up.
For that matter, consider iCan, the "robot" character in Tomorrowland who does physically interact with guests. If someone like that is travelling through Star Wars land, are parents who don't instantly figure out one type of robot can be touched and another can't "stupid" and not having the common sense of a gnat?
Bottom line for me is, the robots should either be designed to be (lightly) handled by guests, or they should travel with cast member handlers who enforce a perimeter, as with Honeydew and Beaker. If Disney does neither of those things, then it is Disney's fault if the robots or the guests are injured.