Kaj_Sotala comments on Harsanyi's Social Aggregation Theorem and what it means for CEV - Less Wrong Discussion
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Sounds obviously unreasonable to me. E.g. a situation where a person derives a large part of their utility from having kidnapped and enslaved somebody else: the kidnapper would be made worse off if their slave was freed, but the slave wouldn't become worse off if their slavery merely continued, so...
The way I said that may have been too much of a distraction from the real problem, which I'll restate as: considerations of fairness, which may arise from bargaining or just due to fairness being a terminal value for some people, can imply that the most preferred outcome lies on a flat part of the Pareto frontier of feasible expected utilities, in which case such preferences are not VNM rational and the result described in the OP can't be directly applied.