But those things generally don't pose an obvious risk to other people: a paraglider who trains above a kindergarten will be regarded differently to one who trai

But those things generally don't pose an obvious risk to other people: a paraglider who trains above a kindergarten will be regarded differently to one who trains on a mountainside. And infectious disease is worse yet: the negligent sufferer can harm others not just through direct infection but also indirectly, e.g. by sickening hospital staff.