(for those of you unaware its the only 100% natural sweetener apart from sugar which does not have the side effects of sugar).
Try, for just one example, http://en.wikipedia.org/wiki/Xylitol
What is that 3rd thing, that has similar properties?
Dude. Stevia may be your thing. But don't put it on the same controversy level as bitcoins (my thing). Of course NutraSweet convinced the FDA to ban it as a sweetener in the United States. Do you think this is the only product to have fallen to the evils of competitive lobbying? Don't get me wrong, stevia is cool, and that it's not in the general market is unfortunate, but one of three top controversies it is not.
I'd put marijuana or drug legalization in general up in the top three. As well as state sponsored terrorism/freedom fighting, cyber-warefare, white vs black hat hacking, debt-based fractional reserve banking, prison labour, torture, genocide, wars in general, starvation, restrictive markets, free speech, global warming, freedom of religion, women's empowerment, demasculinization, voting fraud, two party winner-takes-all system, reduced sperm count, increased cancer rate, obesity and diabetes (which stevia admittedly might counter).
And somewhere much lower is bitcoins.
And much much further below on the controversy scale is stevia (below birth control, hormone and gene therapy, embryonic stem cell research, disease control, HFCS, lack of public transport/rail in the US, aid and trade restrictions in the developing world, to name a few of the top of my head).