I find it difficult to understand with electronic measurement systems available (i.e digital rain gauges etc) and measurement of the track (roughness index etc) it was not possible to calculate whether it is safe to race or not.
Certainly if Massa was saying to stop the race 5 laps earlier - the race controller was certainly not listening to an important source of information -(an experienced driver on the track) and possibly negligent in elevating the level of risk for the drivers' safety by not stopping the race earlier.