Read much?
The headline doesn't say "EVs are catching fire," Sparky, it says "EVs are EXPLODING from water...."
Lithium-powered vaping pens EXPLODE.
Lithium-powered flashlights EXPLODE.
Lithium-powered laptop computers EXPLODE.
Lithium-powered phones EXPLODE.
Are you seeing the pattern here?
Your car catching fire sucks. Your car EXPLODING is suckage on steroids.
As to the question you posed (and then answered incorrectly), "Do we read hundreds of reports about them all year long as if it’s something very unusual?", the CORRECT answer is YES!, the press reports it dutifully every time the car catches fire because it got wet. Or while it was sitting still, parked and switched off. Or if it burns for days on end. Or if it takes tens of thousands of gallons of water to extinguish.
YES, it gets reported EVERY TIME it happens.
It just nothing much apart BEVs meets those conditions.
And lets not overlook the fact that an (uncontained) gasoline fire only gets to about 500°F, about the same temperature as a charcoal grill. Lithium burns about 3500°F, 7x as hot, hot enough to melt aluminum and steel. The collateral risks posed by a lithium battery fire are VASTLY greater than those from a gasoline fire.
Did you every hear of a cargo ship bringing ICE-powered Asian or European-made cars to America sinking because the fuel in the cars caught fire? NO, because IT HAS NEVER HAPPENED. For one thing, they're prepared for ICE-car fires because THEY'RE EXTINGUISHABLE.
But when the Felicity Ace sank in March of this year, along with +/-4000 luxury European automobiles, it sank because there is no practical ship-board method for extinguishing a lithium BEV fire. There was nothing could be done except abandon ship and wait for the fires to run their course. And because lithium fires burn hot enough to melt steel, it was just a matter of time until the ship's hull failed and she sank. 
Lithium battery fires did this. And once they got started, they could not be stopped.