Tesla Logs Show That Model X Driver Hit the Accelerator

Because it is more convenient and allows for regenerative braking. One advantage of electric cars is that the motor can act as a very powerful Dynamo and get a lot of energy back into the battery when braking and going downhill. With two paddles, this would be close to impossible or id imagine it would just feel weird.

Furthermore, your argument that it has always worked and doesn't need changing is also very weak. Why drive automatic when manual has always worked just fine? With manual driving, there is no disadvantage, the majority of people still use it in some European countries and new cars are commonly soled as manuals on purpose.

And yet many Americans drive automatic simply because it is more convenient. One paddle driving doesn't really make driving more or less secure. It is just different and people need to get used to it. Accidents like this are not something news – they have happened a lot in the past and will happen in the future (although manual cars might have an advantage here because you can't drive into a wall very fast when you are almost parked because you have to switch gears to get to a proper speed).