> I see even now sometimes signs prohibiting entering underground parking with natural gas vehicle...

In Portugal that's by law. I had never heard of the VW explosions though and always assumed petrol lobbying was to blame. Either way the law was very effective at killing natural gas cars through mandatory labeling of cars (social stigma) and prohibition of parking in underground garages (big drawback).

I was trying to get a CNG car in California for a while and ran into the issue that the model I wanted was old enough that almost all of them had expired or near expired CNG tanks, the labor for replacement would be very expensive, but that really didn't matter, because new tanks for that vehicle were nearly impossible to find. It's not great that they're exploding, but turning into a pumpkin 15 years after tank manufacture really kills the utility. (Maybe it's easier to replace on cars other than crown vics though)

> Hopefully it will not repeat Samsung battery disaster. Few more cars and it would bring bad publicity for all electric cars.

Strange how that works. A few Samsung phones explode and Samsung phones are declared dangerous. One Hyundai explodes and obviously all electric cars are somehow inherently dangerous.

> A few Samsung phones explode and Samsung phones are declared dangerous.

As far as I recall (I haven't rigorously collected the statistics), about 10--20 phones exploded in the first month the issue was raised. One explosion at any time is an accident, multiple explosions in a month are not. The Kona explosion can be thus regarded as an accident until something more fishy happens.

It's a single car so far... One data point.