riiight…are you the Trail Taliban, or am I? I can't quite work it out.
I'm no trail fundamentalist…
… but this topic used to get frequent airings on mtb-wales.com 5-6 years ago*. My general line of argument was as many of you above have posted – ignorant, stupid people walking up the wall descent, for example, should not be on mtb trails.
However, it was pointed out by the forum admin / owner (and former trail builder involved in the Penhydd build) that FC could not do anything about walkers etc, other than put up warning signs. There is / was no legal mechanism to exclude walkers from mtb trails.
Compare this with the measures installed by FC (at a similar time) to exclude illegal trail use such as mxers. FC could (and have extensively) put in MX gates at the start of each singletrack section because the legal framework allows this.
The inability to exclude walkers from FC land, which has always been an open access land estate AFAIK, means that walkers and cyclists have to tolerate each other's presence. Mtbers understanding this inconvenient truth is a good start.
Furthermore, as I have posted on here several times, just being on a purpose built mtb trail is not going to absolve a rider of liability if they hit someone whilst riding out of control.
* Possibly because mtb-wales was a healthy, vibrant, argumentative 😉 forum back then, but also perhaps because the S Wales trails were some of the earliest to be built close to centres of population…?)