| Racing in the wet is ok, but its the amount of standing water. If rain is too bad in F1 & Motogp the start is delayed. Those conditions for the last race in my opinion warranted an official to intervene and say lets give it a period of time to ease.
We were stopped after 6 laps at Brands a couple of years ago because of standing water. The river running down from Rocket was the cause of Matts off. Those tyres at racing speed cannot cope with 25mm + of standing water, possibly very few can.
So in summarry its a case of how bad is bad before someone says wait a while. | 
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