There is a bias here in the numbers. Teslas are expensive and not everyone is buying them. The lower accident rate can be explained by the different demographic driving the vehicle rather than Teslas being better. For exemple, younger people might be more likely to cause accident because of different factors and they are also less likely to buy a Tesla because they are so expensive. I dont have the numbers for this, but we should all be careful with the claims of Tesla on safety when they compared themself to the global average.