Wait, to be clear, you're calling getting the wrong flavor of icecream a "safety" issue?
Do you have any examples that actually fall outside the 3 types? Your mother is likely not powerful and nor is she a superintelligence. So far the only example you've given has fallen squarely in the third category but even if scaled up would probably fit quite well in the first.
I'd also note that the claim you're taking issue with is a metaphor for explaining things, he's not claiming that magical genies actually exist of any category.
I'm making 2 points:
His metaphor completely fails conceptually, because I'm perfectly capable of imagining genies that fall outside the three categories.
Perhaps the classification works in some other setting, such as AIs. However, the article never provided any arguments for this (or any arguments at all, really). Instead, there was one single example (seriously, just one example!) which was then extrapolated to all genies.
https://www.reddit.com/r/science/comments/3nyn5i/science_ama_series_stephen_hawking_ama_answers/
the vast majority of the discussion is about AI risk.