Yes, they actually are in the 99th percentile of safety among all cars ever tested in the USA (per the National Highway Traffic Safety Administration). So it's not just that most ppl 2 po'.
Here is my crude estimation. If we consider that there are 3.2 * 10^-4 people killed in traffic per car per year[1] and that there are 20000 Tesla Model S on the road[2], then we get that there should have been about 6 deaths.
Now most of the Teslas have not been on the road for a whole year probably so I'm not sure how valid this estimation is.
This seems to be some indication that zero deaths is very low for this number of cars but to be sure I think one would need to make a more detailed estimate. Doing some statistical analysis would also be good.
[1] https://www.wolframalpha.com/input/?i=traffic+deaths+per+car... [2]http://en.wikipedia.org/wiki/Tesla_Model_S
On the other hand, since the Tesla S is a quite high performance car, you could expect it to get into more accidents than the average car.