there is a solution
Put adequate mufflers on the helicopter engines and put a noise limit law in place and enforce it. For example, no greater than 115 decibels within 200 feet of the helicopter at take-off or landing. Landings/take-offs should be done in a manner to reduce noise to a minimum for local residents. The city could place decibel meters (with beacon ID's to identify the offender) around the trouble areas and log violations and collect new revenue if they don't comply.
Better yet, convince the medivac operators to get more neighborhood friendly and enact their own measures to reduce noise.
I am not biased one way or the other regarding this topic. But, I would not want to live in JohnnyBobs's neighborhood with all that noise crap. Nor is it likely he would want to live in my "hood" and put up with all the boomboxes day and night. Which, btw, we already have laws on the books for but they're seldom enforced.