Earlier quoted context omitted.
I'm not sure I can agree with either of you. I definitely don't agree with "thing I don't like should be illegal". And I can't really agree with "People who sold something I don't like should be liable for it's use". I think the "blame" for objects should lie in the people that misuse them. Now, obviously, it's a little hard to come up with legitimate reasons to have a towel hook camera. However... All you're asking…
There is a world of difference between a tiny camera and a tiny camera mounted in a towel hook.
Because with a small camera, what are you going to do? Ban mounts that can hold a camera? You going to ban a towel holder with a pin hole?
Someone is always going to unhappy.
The simple rule for anyone who says “there aught to be law against” is “no there shouldn’t”. There is nothing truly new under the sun. We have broader laws that restrict bad behavior. We do not need to narrowly control life to ever tightening degrees of control.