The only one I knew was as fickle as can be in both her emotions and her decisions. Her emotions ran her actions and her emotions were in so many directions, I gave up trying to think she would be reliable. This is all the experience I have and I must be careful not to draw a generalization from such a small sample.
And sometimes, you get upset about things that us INTPs can tell are mode-locked. If things really can't be otherwise, how upset should we be about them?
Hah! Hahah! Hahaha ha.... Ha... Yes. Yeah it would be nice to be absolutely sure what you're doing is right. I'm pretty devoted (maybe more like 95%) but that's from a choice to be devoted, from the feeling that to really give something a chance at succeeding you need to go all in. But I'm definitely not absolutely sure that what I'm doing or supporting is right. I think that's something that makes me (and maybe other INFJs?) seem aloof and distant... I'm constantly turning things over trying to figure out where things stand, if what I'm doing makes sense, how it fits into the bigger picture, what the problems are, what my real motivations are... Even when I'm involved in causes I find them hard to join and hard to sell. I think if I were absolutely 100% sure of things this would be less the case. I worry a lot about how I know I'm being responsible and doing something helpful more than I'm doing harm, because I know I don't always have enough experience, or information, or foresight, or imagination.I guess I admire their ability to stick to something once they've made their minds up - it must be nice to be absolutely sure what you're doing is right and be 100% devoted. I actually doubt I could do that even if I was an INFJ. .