I can understand Saotome's concern, but I feel Kaoru's anger even better... "seeing it once and then just easily blurting out something you thought I don't know?"
And, dunno with this story, but sometimes, you don't even know, maybe that person has tried to change the situation time and time again, trying this way and that way, yet everything still stay the same...
She's not wrong to be concerned and saying something out of it, really kind of her, just that it's said kinda tactlessly ><