I ride fixed, but not brakeless. Most of the trackies I know think riding brakeless on the road is foolish, but I have to admit that some of those who do it are extremely skilled. The truth is probably that a highly skilled rider, fixed and brakeless, is much less of a hazard than the majority of riders without brakes, many of whose bike-handling skills and situational awareness frequently bring me close to despair. So while it isn't something I'd choose to do myself, I wouldn't generalise.

And since it isn't illegal, at least here, to ride a unicycle on the roads...