Hmm - it's a bit like asking a skier to justify why he pays a hundred quid to go to the top of a mountain, only to come back down and then do it all over again and again. And skiing is my other hobby....
For me flying and skiing are the best fun you can have with your clothes on. I wonder what it's like trying both at once.... anybody know of a light a/c with skis I can try out...?!
Aviation = fun = jobs = employment. Aviation can saves lives. It brings people together and allows us to broaden our horizons beyond the end of the NIMBYs' backyard. No further justification should be needed. And if they don't like it, we should be able to get a compulsory-purchase order to bulldoze their house and build another runway...
What proportion of 'objectors' to flying are more than happy to travel to someone else's back yard, jump onto a 737 and head off to the Costa for their holidays? Without grass-roots aviation (at the very least to train new pilots) there would be no 737s and getting to the Costa del Mucho would be a long drive....