"I read this and I think Horseriding is not an appropriate activity for a public areas. This thread has highlighted ovr and over again how unpredictable and dangerous horses are. And not just with an off lead dog. Maybe it's time horse riders took their unpredictable, skittish horses onto private land only?"
Give me a scared, skittish horse over a human being any day. Horses I can cope with. Someone driving along at 60mph yacking on their mobile on a country road ("it's the national limit, I'm a safe driver") not so much.
IMO there's been rather too much talk on here about horses' unpredictability when actually it's pretty obvious that a prey animal will be frightened of a predator. The surprising thing isn't that horses sometimes spook at dogs - the surprise is that they'll actually tolerate an entire pack of hounds if we ask them to.
One of the reasons horses are used in therapy for conditions such as autism and ptsd is precisely because their reactions are relatively predictable and consistent.
It's a prey animal that feels much safer when in a group with other horses. Therefore, if another horse tries to pass it, it will probably want to go with it. If it hears crackling ice, it will spook, (as booboostwo knew her horses would spook) because crackling sounds at ground level could mean a predator. If it catches sight of a group of fast-moving cyclists out of the corner of its eye it's likely to be frightened. So when you're on the road you keep a look out and prepare to bend your horse's neck slightly to the right so that it sees traffic out of its right eye and spooks to the left, away from the traffic. It's not frightened of plants - it's frightened that a plant moving could indicate a predator lying in wait.
Yes, there are risks with horses. Yes, some very experienced people get hurt or worse. But I agree with Elke, there are many risks in life. You can mitigate them to a degree but you can't cut them out completely.