an interesting exercise would be to map those homes sold/purchased within the last 8 years and match the addresses to the proponents of the protest - people bought cheap because of the airport proximity then (like in SYD) - they want everyone to compensate them.
I don't care what anyone says but Mike Falls' DC3 cruising in at dusk on a summer's evening with the CBD skyline in the background is a magic image that stops traffic, ............I'd even bet that the most passionate airport opponent would (quietly) agree.
Did however note that the airport protestors are a little light on solutions of where to park the Air Ambulance, Police, AMSAR, and the odd Skycrane in the bushfire season. As for the token pollie attending....well light on is probably an appropriate description.
Maybe offer the protestors a raffle for a ride around the city in a JetRanger or Squirrell with funds going to the RFDS might be a good counter point on the day!