Peter / Graham
I'm not arguing the fact that (assuming theft for scrap value is ruled out) removing the gates would appear to be a particularly stupid thing to do. My point was that it is unhelpful, with an enquiry going on, to speculate in public. We don't know that it was a theft, we don't even know if a crime has been committed (in the technical, legal, sense even if we all agree that, morally it has). It's up to the guys running the investigation to establish those facts, so let's leave that side of it to them.
Sensible discussions as to what we, as a community can do to help stop it happening again are a different matter entirely. Personally I'd suggest that, once identified, the culprits should visit each caving club in the UK for a ritual flogging!