The pilot's vacillation over returning reveals how difficult and ultimately arbitrary such go/no-go decisions can be. He has an appointment; well, no, he will stay; well, no, another pilot took off, why not me? There is hard evidence on which to base a decision: there is IMC along the route, and the briefer has said the words "VFR not recommended." For some pilots, this would be a sufficient deterrent even if the sun were shining in a clear sky at the departure airport. But once a pilot has decided that he can outsmart the system, and has successfully done so one or more times, the decision becomes far more difficult to make.