Creampuff, personally I don't think it's funny that ANYTHING flying at whatever level in the j curve doesn't have a transponder or radio. It's stupidity of the highest order.
Secondly, there were 2 aircraft involved in this airprox, neither of them on area OR CTAF. I only needed to speak to one of them, no cigar. One of the aircraft then flew within 1nm of a drop zone, it's published on maps. If you haven't got a radio wouldn't you think the operator would have the brains to give the drop zone a wide berth? Obviously not. No radio, no map, no common sense.
It may just be the end of the world for one or both of them next time.