I'm aware of that, and I am not freaked out. I store my extra batteries in a metal toolbox in my basement. I don't charge batts while I'm sleeping, and I use a passthrough without a batt in my car.
I'm irritated that while this industry doubles every year, people here, of all places, pretend it isn't a problem.
Before the egos came out, cigalikes..., 801, 901, 401, came with a charger and proprietary connectors and that's what you used.
There were only a few commercial mods available, but you couldn't just pick them up at a gas station and charge them on whatever they fit on. The only fires then were from stacked unprotected batts in mods.
If you built your own, you learned about battery safety in the modders forum.
The standardization of the 510 connector changed everything. People think everything is plug-n-play. If it fits, it OK.
BTW, I think the mod in Florida was a Prodigy. Someone earlier said it was a Chuck. It may have been. The details were kept pretty hush around here. There was speculation that he bought camera batteries... Just a lot of talk and rules about vents.