Critics of the RBE often produce "it won't work" type arguments, as if everything's fine now and there was no finacial meltdown, impending environmental disaster(s), starvation, war, etc. I sometimes wonder if they accept that these things are problems, and that we should look for solutions to them.
If everything was going pretty well, and we came along advocating tweaks, and people said that a tweak wouldn't work, and showed why, the objections migh make some sense, but at the moment it is like going to the doctor with a disease, and whatever the doctor suggests, opining "it won't work".
Perhaps people don't care about wars and starvation that don't directly affect them, but the enviromental catastrophes are eventually going to affect us all either directly, or when people start to move from affected areas. So people need a strategy for at least that.
On natural disaters, Brandy Hume (Take TVP challenge) points out that when individuals and goivernments collaborate to deal with the aftermath of a naural disaster, it is widely seen as good. TZM proposes coming together to face planetary problems before they occur (as far as possible). We're told it won't work, we're a cult, etc.