All I can think of is what if an electric car’s battery gets punctured.
It happens, but a punctured battery is much less combustible than a punctured gas tank.
For example, the Chevy Volt has been much maligned, but the only fires ever associated with it were two that happened after the Volts were demolished in crash safety tests. In both situations, it took over a week for the car to catch on fire! (It turns out the test engineers failed to properly drain the batteries after they were damaged.)
So if you get into a terrible accident and it takes you a week to get out of the car, you have bigger problems to worry about, in my opinion.