I ride no-handed all the time in reviews... while filming, to demonstrate stability of the bike in question. I turn by applying pressure to the nose of the saddle and leaning with my body weight. I don't want to see anyone get hurt, but even riding a bicycle could be considered dangerous or a risk compared to walking, driving, or riding a trike.
Counter arguments... unicycle riders ride without hands 100% of the time, because they don't have handlebars. Some people make an entire career out of riding with no hands and no feet