Any car handbook will tell you not to get under a vehicle supported by a jack alone so unless the LR handbook says "Do not tow with this towbar" your analogy is flawed.
You don't know how analogies work, do you? My point was if you don't follow the instructions, don't complain if the result is something you don't like.
The Land Rover manual for that tow ball (LSB 10 02 99 122) says:
ESSENTIAL TOWING CHECKS
DO NOT exceed the revised nose weight limit of 150kg (330lb).
When the quick release tow ball is not required for immediate use, it should be removed and stowed in the appropriate place.
HEAVY DUTY MULTI-HEIGHT TOW
BAR SYSTEM
If there is a requirement for towing with a greater nose weight, for example, commercial or constant use towing, Land Rover Accessories have available a suitable tow bar system.
The hitch pictured does not appear to have been removed and stowed. The lock mechanism does not appear to have been lubricated. It does not appear to be a suitable tow system for the purpose used.
You can argue all you want, but if the hitch had been used properly (i.e. removed when not in use and fitted fresh every time) then the mechanism would have had regular checks, and perhaps the accident would have been avoided. It is down to the operator of a vehicle to ensure that the vehicle is being used correctly.
You wouldn't say that someone with a Sankey trailer was correct to use a standard tow ball with the NATO ring, even though a standard ball is perfectly adequate for towing a trailer larger than a Sankey. It would be the wrong hitch for the purpose. Same here: despite what people are saying on this thread, there is nothing intrinsically wrong with the removable hitch as supplied by Land Rover, BUT (and it is a big but) it has to be used correctly and for the correct purpose. I wouldn't trust a horse box to one, but I would use one for pulling the occasional trailer full of stuff, and for caravan towing.