It could certainly just be a numbers game
FWIW, here are numbers:
Gasoline-powered cars: 1530 fires per 100,000 sold
Hybrid cars: 3475 fires per 100,000 sold
Electric cars: 25 fires per 100,000 sold
Source: https://www.kbb.com/car-news/s...
An interesting aside: The delivery trucks used by the US Postal Service for the last 40 years are crazy fire-prone. I learned this recently because my brother is a mail carrier and a few weeks ago he was out delivering when he saw wisps of white smoke from under the hood. He pulled over and jumped out to investigate, but by the time he got out it had turned into large black streams of smoke and by the time he walked around to the front he could see small flames. Instead of popping the hood he ran to back and started pulling the mail out. The fire truck arrived about two minutes after he pulled over (this all happened about 100 yards from the fire station) so a couple of packages in back got a little damp but he got everything else clear.
His boss brought him another truck about 10 minutes later and he loaded it up and finished the route. Neither snow, nor rain, nor external engine combustion stays these couriers, you know.
Mail truck fires are so common there's even a web site that tracks them: https://mailtruckfires.com/. This is my brother's truck: https://mailtruckfires.com/uta...
There are four or five distinct serious design flaws that make mail trucks fire prone. Mail carriers are excited about the new trucks that are coming, which should be much better. Many of them will be EVs.