forum for week of 14 Nov: when we don't want knowledge

If a kis is crying and I'm trying to stop her from crying I might try to figure out why she is upset. I would perceive, reason, etc. why she is upset, however it isn't neccessarily the knowledge of the cause of her crying that I'm aiming at but rather any belief that would lead to a sollution to stop her from crying. So although she might be crying because she scraped her knee, I might decide to belief that she is crying because she wants some ice cream and her parents won't buy her any, and although the belief is wrong I might be able to stop her from crying by buying her ice cream, and it doesn't really matter to me whether the belief is true or not true, so my aim isn't knowledge but any belief that would be useful