I really hate these what if scenarios. Has anything like that ever happened? And if not, what are the reasonable expectations that it could happen in the future?
All of this drone nonsense is just hyperbole to the extreme. I have never heard of a drone colliding with a helicopter. Also because airspace below a certain altitude is public space where one can fly such a drone legally, it's kind of a grey area as when not to fly drones in that space.
Emergency services are all fine and dandy, but i have seen video of firefighters purposely trying to knock down a drone that's flying a good 100+ft away from them with a pressurized hose for no good reason.
Either you make it illegal and propose fines for people flying drones in restricted airspace (and you better damn well have a way of communicating when and where a restricted airspace is) or you suck it up and figure out a way to keep your personnel safe.
You do not allow people to arbitrarily destroy private property.