I obviously echo what everyone has said above and it is a really sad loss.
However, the point I noticed doesn't seem to have been mentioned elsewhere which is why wasn't the race red flagged and he receive treatment on the track where he had come to rest and sod getting the track clear before the riders come round on the next lap. He could then have been secured, loaded straight into the ambulance with the minimum jarring and manhandling with maximum care.
In the WSB race, just hours before, Haslam also had a prang being hit by riders from behind and the race red flagged to ensure he could be properly treated in case he needed it and although he didn't, nobody complained about the decision. In BSB we see red flags and pace cars all the time to achieve the same thing.
I remember Julian Ryder being critical of the "assistance" given to a very dazed and obviously hurt Scott Redding to get him onto the stretcher and seconds later an image of a rider on a stretcher being dropped as the course workers/marshals struggled accros the gravel trap trying to get clear before the bikes came around again. If that was Tomizawa, I'm sure it didn't do him any good and we never saw him actually get put on the stretcher in the first place.
I personally think there are some serious issues to be raised here and given the hoo-ha dished out to Williams by the Italians when Senna died over 10 years ago (also at the San Marino Grand Prix albeit different track). I also remember Kato was also killed in an incident where there was no red flag.
It is a sad loss but was it preventable with a red flag ?
