Times have changed. Primary radar is not the prime means for civilian air traffic deconfliction, the volume of traffic has increased and we simply cannot tolerate the mid-air collision risk with some petulant idiot flying through crowded skies not talking or squawking.
True, but then if said aircraft are accompanied by a couple of Typhoons (or whatever) which are themselves squawking, as I assume would be the case, then the mid-air collision risk is greatly reduced. The FJs are effectively saying
"there is a big aircraft here, stay clear"!