Cap'n Chris said:
However, it does work. Often very well.
With parallel universe theory this is easily proven; it cannot be proven beyond doubt any other way though sadly. We do have caves adjacent to each other where one is actively managed and the other is free access; the FA ones are in a sorry state, the AM ones are near-pristine. Not absolute proof, but pretty darn close.
AM usually involves gating and warden leadership too; this, combined with taping, is presently the undeniably effectively best method of conserving sites for the long term while simultaneously allowing visits (many decades of effectiveness at some sites, which would otherwise be wholesale trashed by now if not).
What does NOT work is trusting visitors to be conservation-minded. Certainly in the UK this is a fool's paradise. Perhaps elsewhere too. It only takes one person a single trip to destroy a cave.
I wonder how much of the preservation is a result of taping and how much a result of the rest of the active management; gating, wardenship, etc.? Has taping been shown to make a difference in caves where it is the only measure taken?
Indeed, trusting visitors to be careful does not work. I don't think trusting them to respect the bounds of a taped path is realistic either. I suppose the only thing that really works is to keep people out unless they are known to be responsible or can be monitored.
Points made about population density relative to caves in the UK are well taken.
I suppose that my objections to flagging are really my way of mourning the disrespectful attitudes that make it necessary, and the little-minded motivations that lead people to place it
unnecessarily. Most of the examples I've seen seem to have sprung from thoughts like these: "There's something pretty, we're supposed to put tape all over it, right?"
"For goodness sake yes! We must protect it!"