I suppose they've just never thought about it, some people aren't very in contact with the natural world. I wasn't so much when I was younger but now I think about it all the time. A while back 2 ecologists became my neighbours, now I'm even more involved. They've introduced us to moth traps, educated us on the pipistrelles and the different dragonflies and they bring rescued amphibians to share the ponds with our resident great crested newts. Now everything I grow I think, what will like that?