My sister had an older Nissan Altima burst into flames on the freeway while driving in a straight line at 70mph. Judging from the number of scorched sections of pavement and subsequent burned grass along the highway I see on a weekly basis, I'd wager this isn't uncommon.

Sure it's an anecdote but your comments here seem to believe this is impossible or incredibly uncommon with ICE vehicles. It's not. Watch along the freeway for burned sections at the edge, with the scorch marks being about the size of a car. The reason you don't hear about it is it's not news when an ICE car burns to the ground, since it happens so often. It's news when a Tesla burns because people want a reason to be scared of something new and flashy.