Haha. I can read your comment as a joke, and if spoken in conversation in response, I think it would go down well :) But since I have a minute, it’s also fun,

Haha. I can read your comment as a joke, and if spoken in conversation in response, I think it would go down well :) But since I have a minute, it’s also fun, perhaps, to play around with the idea that you thought "we don't know what we're doing" wasn’t - but it is! - another way of stating the same thing that you say: that we don't understand the consequences of our actions. It’s interesting, because your rephrasing highlights the nuances of language, and the difference between literal and idiomatic, or perhaps more metaphorical interpretations. And even the differences between languages. It's likely to be very different in other languages, such as German, or Japanese, perhaps. But in English, the phrase, “you don't know what you're doing”, is most commonly used to mean: you do not understand the consequences of your actions; These will produce unintended effects, that will likely be different to your intended effects. In other words, the phrase I used, in English, almost always includes the situation that you describe, rather than the seemingly more literal interpretation of “You are not aware of, nor comprehend the very actions themselves, which you take or plan to take, regarding this thing”. It is fascinating to flip it around and see that idiomatic phrase through that more literal interpretation, that I’m assuming you made, whether for comic phrasing or not, mind! And curious to wonder how we came to have one meaning pointed to by the sign for the other. Although, due to the nuances of language, I can’t even be sure that it is to this more literal interpretation that you in fact are actually referring! It could be an even further far afield interpretation that has eluded me, and all the other commenters here thus far. The endless Fascinations of language! that’s probably why we rely on idiom. But no disparagement to you for, whether knowingly or not, trying something a little different. Haha! :)