EXACTLY most of what people consider common sense is things they have learned which may not be that common.
BTW, you can walk either right behind the horse or out of leg reach. In the middle is where you get pounded.
Common sense would tell me to get on the horse, instead of walking. That's what they're for.
In the matter of learned vs. inherent I will concede to a learned aspect. I have learned many things the hard way, as we all have, but I think, relating to some more than others, that there is a predisposition to possessing certain abilities to deduct the outcome of ones actions. If you use a sawzall to clean your toilet your are going to make a splash. Some people don't get things like that. They lack common sense, whereas, a person using a toilet brush knows the difference.
Regarding fear, I believe that it is another component of common sense. It is called common sense to think about your moves when walking behind a horse but the reason you even have to think about such things is that you watched your Uncle Bart take a pair of horseshoes to the midsection and he was pissing blood for a few days before he underwent emergency surgery for a ruptured spleen among other things.
I don't use excessive force with my guitar strings because I'm afraid to have to buy new carbs.
The inherent fear of certain things is why we come up with these little rules called common sense.
Some folks don't have that fear and then they do dumb things, like wallow out their jet with a roto-zip. I guess the bottom line is to not be afraid to work on your bike as long as you maintain a fear of messing it up. Does that make sense?