I don't condone blasting through gliding sites on a VFR bimble, however, how do you know that the helicopter was not a pipeline survey, or other type of survey aircraft. I speak from experience of trying to negotiate 'clearance' into gliding sites to survey, and a lot of the time have been sharply told 'we're busy all day, stay clear', only to go and 'have a look' and find that there's nothing going on, not even a car in the car park! Even then I feel guilty flying over the bloody place, I've worked over Hinton, Weston and various other 'dangerous' place and almost felt welcome.
A change of attitude is required.