Not everybody comes to logic by reading books; for some it's just a matter of common sense.
Maybe, but I think it's safe to say that where something called "common sense" is being all too frequently referred to as a supposed equivalency for the ability to make an "intelligent choice," we end up only really referring to some very low hanging fruit.
More often than not, common sense ends up being a kind of folkish expectation about positive outcomes that we think surely must come simply because we like to apply some optimism to our moral choices, like the idea that "if I just pull out soon enough from a heated situation, then I believe nothing consequential will happen."
This more 'common' sense of common sense often emerges as the fallacy that it is:
en.wikipedia.org
Yeah, that's more along the lines of what passes for "common sense" these days. It's usually not referring to one of the other denotations of the same term that may present us with a more developed notion about which senses in the human mind are truly common, such as are suggested by Thomas Reid as but one older example.
It can also be thought of as one that plays out in the thinking of Thomas Paine. Whether his notion is common, and whether his was politically and morally correct in the first place, is another matter.
Personally, I tend toward being skeptical like Descartes; it's always best not to be too sure of one's own assumed sense of common sense, especially where epistemic issues may arise and become relevant where Ethics and Morality is concerned.