This isn't a health and safety over-reaction, it's about louts killing innocent people, at least potentially. There is no excuse whatsoever for a great deal of very bad riding and they should be banned and have their bikes confiscated.
People who come here to enjoy some fast riding on the mountain, and who respect others right to be on the roads, are very welcome.
Certainly some of them make mistakes and, sadly, come to grief, but this is not about mistakes, it's about arrogant, hooligan behaviour with disastrous consequences not always to themselves.