The desires expressed by 'Would that everybody desired X!' and 'Would that everybody desired that not-X!' are not compossible, except under the condition that everyone holds inconsistent desires (both for X and for not-X)

Again, Russell’s brand of emotivism is immune to this objection. According to Russell, “X is good” and “X is bad” are really in the optative mood despite their indicative appearances. As such, they express desires or wishes, and desires and wishes can, in a sense, be inconsistent with one other, namely when they are not (in Russell’s phrase) “compossible”, that is, when they cannot both be realized. “Would that I had all the ice-cream!” said by me and “Would that I had all the ice-cream!” said b