It's not just vehicles. Battery fires from electric bikes and scooters have also caused issues. And currently you can't put a battery pack into plane hold luggage because of fire risks.
The presence of a different failure mode isn't the question at issue. Yes, they're new tech and require new techniques. Duh, as it were.
It's your abject and frankly irrational paranoia that I'm calling out. Chill the fuck out, as it were. Moving things have always been dangerous, and if you believe this represents a change in aggregate risk you are simply wrong.
Many rightly are.