Transponders and safety
I note that transponders are a major part of the equation.
This is currently a hot topic amongst pilots, since Your Tax Pounds At Work (as funnelled through the CAA) are insisting that in the near future, all aircraft of any description will need to carry a transponder.
The initial proposal was simply ludicrous, since it also covered hang-gliders, paragliders, balloons and sky-divers. Bear in mind that current transponders are the size of a briefcase and need serious current (ie. a car battery) to run them. The CAA insisted that mandating their fitment would create a market for someone to develop smaller, better transponders. Everyone said they were talking rubbish and it would destroy sport aviation. Consultation meetings found that of the people who dreamed this up, there wasn't a single person who'd done any gliding, hang-gliding, paragliding, ballooning or sky-diving.
They've now dropped the more insane end of the proposals - hang-gliders, paragliders and sky-divers are now exempt. Fixed-wing gliders and microlights are still caught though. One reason given for this is safety - but a glider pilot pointed out during consultation that there hasn't been a single mid-air collision between a glider and a powered aircraft in 50 years, and fitting transponders to gliders is unlikely to help prevent glider-vs-glider mid-airs, since gliders are unlikely to have the gear to *receive* transponder signals (another large box of kit in its own right).
But the original proposal made it clear why it was happening - so that UAVs could roam the skies freely, safe from nasty fleshy pilots.
They've sadly ignored the fact that we also share the sky with non-human aviators. Swans, geese and other birds don't generally carry transponders, and a full-size goose hitting your windscreen at 100mph is not a recipe for a healthy aircraft (although it's a good recipe for goose mince).