CA and most states take a enviro-whacko stance on clearing brush...thinning overgrown forests...you know "tinder" for fires. Throw in morons throwing gender-reveal-parties or crazy pyro ladies calling themselves a shaman...well...karma...
As for the mower blade...would need some feldspar present or something akin to it to spark...anyway, don't most people mowing have access to water...lawn hose...something? Hard to see how that could get out of hand unless you let it. I've had old mowers get clumps of dry clippings on exhaust and start smoking...stop, take care of it...mow on...
Pretty sure it is more to do with laziness and stupidity than product liability...
