I'm not disagreeing that Tesla's vehicles are safe, but I wonder if some of it's safety record is due to it's price and styling.
Because it's a high-priced vehicle, it is immediately out of the price range of certain (potentially, high-risk) drivers. Also, due to it's price, owners may be more cautious while driving it. In the same way, the styling might not appeal to younger, more riskier drivers, especially a SUV.
For example, while it may be common for a teenage male to be drag-racing a Honda Civic, you probably won't see too many doing that in a Model-S or Model-X.