So if somebody asks you if you'd like to be hit in the head by a brick, you'd presumably answer "I don't know". Unless you happen to have read a study performed by experts on the exact impact to cranial integrity of various sizes of brick?

Or are you a normal person who can synthesise opinions based on existing (but not exhaustive) data?

Does 2 and 2 make 4, or can we not be sure until I first cite some leading light in the pure mathematics space who can back my assertion up? Do I also have to provide the proportion (and on a side note, I'm not really sure how you decide which proportion is "correct", since this problem is entirely recursive) of other mathematicians who agree with them so that you can make a rational judgement on whether to ignore them or not? What's the threshold where you just throw your hands up in the air and proudly claim ignorance?

Similarly, people usually don't have to understand every line of the 2023 US Tax Code to understand that giving people tax deductions for doing a thing incentivizes that thing.