:He is taking off and landing right outside our houses, which has got to be dangerous
erm...not really, no...
No helicopter movement is 100% safe, so the fact that he is moving in close proximity is bound to be more dangerous than if he was not there.
The real issue is the risk - probably much, much smaller than said lady falling down the stairs /cutting herself with the kitchen knife / scalding herself with the kettle.
Anyone have any figures for injuries sustained to a person on the ground from a falling aircraft in UK?