Gouli,
Thanks for your reply to my question, on reflection I am surprised that you have not given me the reply I deserved for what was, on reflection, a fairly stupid idea. (and one that my embarrassment has required that I deleted!)
I think the question I was really asking is that there may be some way of offering additional security to rotary aircraft that operate low and in the vicinity of crowded areas even if this was at a cost to performance. I appreciate that it would generally be too low for a ballistic parachute to be practical.
I remember when ballistic chutes were first considered for fixed wing the general reaction was not positive for a number of reasons. Nowadays, however, they are accepted and the pilots using them no longer considered 'cissies'.