"well, planes (up to B737 etc.) at our local airport here (LOWI) depart
over
the city, too. we can't shut down the whole city for all those planes.
And
our rescue helicopters are flying over our highways, too. halting the
traffic on this very highway brings half od Europe to a stop. "

Now there's a silly comparison! There's a difference between an
airliner taking off or LifeFlight helicopter flying to and from a
hospital and a helicopter carrying an external load and probably
operating near its performance limit (mountainous terrain, heavy load)
over children and tourists. In Europe, are school kids allowed to tour
local construction sites and stand underneath as materials are lifted?
If this is prohibited in Europe, the same common sense applies to the
even more dangerous operation of helicopters lifting concrete.