All I can say is WOW that is unreal. Can not understand the logic of stealing a car and then torching it there must be more to the story someway.
Not much in the way of "evidence" survives a fire. Residual DNA, fingerprints, dust/dirt/particulates that could link back to the thief - none of it survives a fire. Unfortunately torching the car was their insurance policy for not getting caught.
That is assuming this was a stolen car... This could also very easily be insurance fraud, not that I'm attempting to point any fingers. I saw a white Cuda on a flat-bad and for a moment feared it was MY old car... Mine was round-tailight though, so no.
Sad though - very sad.