This is like saying, "A self driving car is a bad idea, because the user might enter the bottom of the ocean as their destination.".
I don't really understand the self-driving car analogy. A better analogy would probably be three cars hitched together.
If I take my car and intentionally drive into the ocean, I expect it to continue until the engine dies, and then I do shortly after. Why should machines start prohibiting me from doing stupid things, if I want to do them? I think Isaac Asimov wrote a parable about such a future.