Not sure how many multi-storey car parks have been destroyed by electric cars catching fire (I'm not aware of any), but the one at Luton airport which destroyed 1400 cars was initially reported to be due to an electric car (usual hysterical press speculation), but was later found to be due to an electrical fault in a diesel Range Rover.
Are news articles still hysterical press speculation / conspiracy theories if they turn out to be true?
https://www.youtube.com/watch?v=AmbHpqWjMVE Electric cars catch fire in carparks.
https://www.youtube.com/watch?v=1zaV-JSwzzA Tesla still on fire underwater.
It's no speculation or exaggeration to say electrioc car fires are tough to put out. Speak to anyone who works in the fire service. https://www.youtube.com/watch?v=qwxZu3nVOZ0
I'm sure in years to come they'll be perfected but that won't be happening anytime soon.