There's actually been a lot of research on Earth, not necessarily about hacking brains, but hacking people's computers and information. And sometimes tapping into that can be useful because if you know what you're doing, and someone else doesn't, you can find things they've missed.

I guess with everything, it's consent that makes the difference. If I know you're going to steer me, I'm less likely to care, than if I'm suddenly flailing across the park, if that makes any sense.