A limey buddy of mine had a Jungmeister, and the amount of RF the Siemens radial generated made any sort of radio installation impossible, so he used to fly around keeping a good look-out. Are you suggesting he shouldn't be allowed to fly without a radio in uncontrolled airspace?
Not at all - but if an area is notamed for display practise or something else that considerably increases the threat level he might be better avoiding that bit of airspace - they are not usually that big that avoiding is a big problem!