We’ve upgraded from burning our houses down to burning our atmosphere down which will absolutely poison humans for centuries to come. And since we now burn larger fires with black rocks, those release far more magic rock dust that poisons people than the magic rock water heaters do. Not to mention that fire has both killed more of us cave dwellers than magic rocks ever have (including the flying weaponry runes made from them) and have caused more ecological disasters, so fire is much worse.
Then we talk magic mirrors, they have evil rocks in them that get in our rivers and we don’t contain well. That aside, we show tradition to our ancestors by making much of them with slavery.
And the magic fans? The design is very human. They’d be a gift from the gods if only the spirit of the wind were always with us.
Summary: Magic rock still good, black rocks and black water make bad fire and hairless monkey make sick more.
One must be very careful when digging for magic hot rocks or else you expose the evil spirit vapors. Our ancestors knew that where there is magic, some evil lurks. As they did then, we do now when we accept a better evil in return for the magic we believe may do more good than before.