Yeah, there's been a few fires. I'm not one to stress about unlikely events, but I'd still at least practice how I'd tug a flaming vehicle out of the garage, and install a smoke detector in there.
In my estimation, an unlikely but catastrophic failure of a single cell in a battery should not result in the whole thing going up in flames. Bad design. As I said, batteries suck. They are essentially expensive gas tanks, slow to refuel, heavy, bulky, and potentially catastrophically failing. They need to get a lot better.
EVs are better in every aspect except for the stinkin battery. Cost per mile on electricity is about 1/3rd on average. My cost to drive my 30 MPG Acura has been 11 cents per mile. The Prius plug-in was 6 cents per mile on gasoline, but 3 cents per mile on electricity.
The electric grid can be made more efficient if EVs are mostly charged at night. Bringing baseload usage up narrows the difference between peak and off-peak. It's not the amount of electricity demanded from the grid that makes it cost more, but the difference between low demand and high demand. That needs to be balanced as much as possible.
I've been saying plug-in hybrids are extremely undervalued. You minimize the thing that sucks the most; the battery, while maximizing the utility of it. No range anxiety, plenty of performance, and cheap commutes.