I see how that is intuitively true, but it isn't really true in practice. Post crash fires with ICE are unusual, but not extremely rare. Similarly, post-repair car fires (leaky fuel lines) are not as unusual as most people think.

So far, experiential evidence with Tesla seems to be showing a lower than average risk of fires, though the breadth and nature of the battery leads to challenges in managing the fire itself.

All cases that I'm aware of proceeded at a slow enough pace to allow evacuation of the vehicle.