I don't think EV fires are a real problem but humans don't like change and vested interests are happy to spread disinformation, like pictures of fossil gas powered buses on fire, just to attract internet traffic.
EVs aren’t a major worry, said the International Union of Marine Insurance following the Fremantle Highway fire.
“To date, no fire onboard a roro or Pure Car and Truck Carrier (PCTC) has been proven to have been caused by a factory-new EV,” the organisation said in a statement.
I have a 10+ year old EV and it hasn't burst into flames.
In terms of the age of the whole EV fleet, it's early days yet, but the initial advice seems to be that electrics aren't as fire prone as petrol cars. They are more difficult to extinguish but the fire services once had to deal with haystacks as horse fuel, and have learnt how to deal with petrol fires since then, so I expect they'll have the resources thought out soon :
The US National Transport Safety Board’s 2022 study revealed that hybrid and petrol cars were more fire-prone compared to all-electric cars.
Moreover, with constant improvements in battery technology and engineering, the rate of fires among EVs appears to be reducing – Tesla vehicle fire data revealed that there are just five fires involving Teslas for every one billion miles travelled.
Forbes is a bit more circumspect :