So here's a funny thing. I 'invest' in equities, buying a small cap in the Uk. The price is unusually tight - the spread is just 10%. I do it T+10, which gives me a level of leverage I can't actually work out. The stock moves, but the spread just gets wider and although it trades 15% higher than where I bought it, I can't out of my position. Nobody comments on what a shite and unfair market this is, but a well-respected journalist writing for a well-respected paper says that FX is crap, so we all believe him and continue to kid ourselves that equity is fair for all & sundry.
Or perhaps we don't. FX is only a casino for those who treat it like it is. FX trading can also be precarious for idiots, which includes a lot of buy siders and retail Johnny Mug punters. For a lot of other people, it is a proper asset, which is transparent, easy to access and cheap to trade.