I agree that it in not appropriate to jump to judgement in blaming the corner workers and other emergency crew. However, it is not a particularly American phenomonon to do so. From what I read on many other boards, the same reactions are widly expressed by Brits, Continentals, Aussies etc.
I believe that rather than assessing blame, the organizers should reasses all the procedures in such cases, along with track safety issues. This is pretty much the same process that occurred in F1 following Senna's death, or in NASCAR following Earnhart's death, or by NASA following the shuttle tragedy. Finding things that could be improved to reduce the risk in the future is a positive response, while finding someone to blame is a negative response that is likely to get in the way of finding the truth of what happened.
The best legacy for Kato would be for motorcycle road racing to improve track safety and improve the processes for dealing with serious accidents that do occur.