I hate to butt in - but I read this forum avidly not 'cos I spearfish (never have, never will) but because my main interest is photography (and S Dorset is my main area) - see eg
Picasa Web Albums - David P - UW-F30-UKBest - and principally freediving rather than scuba. There's an awful lot in common (apart from the killing and eating end of it). I've learnt a lot (about stalking fish...) for reading stuff here and elsewhere. I admire your skills... even though I'd give anyone with a speargun a very wide berth indeed! And it's great to get feedback on local conditions (I live near London - and pick my moments to escape...)
So yeah, there are conflicts and differences - but certainly, some non-spearos share very similar goals to yours. No doubt some of our paths will cross one of these days.
David P.