you'll see that it's a 1% event
The bus depicted in Belarus is burned fast and with big flames in short time before loading 20 cildrens for a trip.
I have no idea about what type or rethoric of low event case it might become in front of possible burned alive childrens.
The bus burned in China present too a high power of heat in "non collision" situation.
The car burned in Norway become fires at short stop for WC.
In that way the situation is only to wait a bigger damage with more casualties.
The presence of High Voltage caves and batteries, the possibility to charge batteries make the HEV dangerous at the same level as EV.
BMW i3
You suggest not to use all the appliances?
At least someone need see what might happens if You got such explosive thing in Home Garage or You will use it for the family trips.
BMW i8
Fisker Karma exploded
A fire broke out on Tuesday in a building housing an auto battery laboratory at Geely-owned Volvo Car Group's plant in Gothenburg, in western Sweden, the company said.
...
This is the second fire at Volvo Car's Gothenburg plant in less than two months. In early February, another building, housing a test facility, caught fire.
http://www.reuters.com/article/geely-volvo-fire-idUSL5N1H52OP https://www.youtube.com/watch?v=8PUG-ldjD48Nissan LEAF in fire
Chevrolet Volt lead acid battery, Collision Caused fire
Chevrolet Volt in Seattle