From the aerodrome perspective...
Firstly, many thanks for the links. A salutory lesson.
By coincidence, I'm running a course for new recruits to Airfield Operations and we're covering ILS at the moment. They don't know it yet, but they're going to sit through this video next time we're in the classroom. Our ILS installations have critical areas marked out with fences, posts etc and we teach people NEVER to enter these areas without permission from the Tels guys, not even when cutting grass or chasing intruders on the airfield etc etc. We also teach what the funny little aerials pointing at the Glide & Loc arrays are for - the field monitors and how important they are and not to bash into them.
We have a comprehensive system of Works Permits for ANY work that takes place on the Manoeuvring Area and a 'no blame' culture which encourages reporting of damage or possible contact with any installation.
It is still disturbing, however, to hear that it is possible that our installations may not 'fail-safe'.
Cheers,
TheOddOne