I also believe education and practice can hone skills. I'm not saying that everything is predetermined or fatalistic. I do not argue for that at all. Everything has a cause. Perhaps your personality is one that doesn't handle loosing in a spar particularly well and therefore you choose to be ready for the next time.
What I'm saying is that the reason we do the things we do is because we have a reason to do them. If you say you choose something you've never chosen before then you must be reasonably open to new experience.
Consider that you did not have a choice of what genes you have, you do not have a choice of what family you were born into, you didn't choose how your family raised you, what they valued, what professions they did, what kind of influence they had in your local community, you didn't choose your family friends, you didn't choose your school, you didn't choose who you gravitated toward and who you were repelled by, which personalities you get along with and the ones that you don't. I can go on and on and on. All of these things make up our life experience. Our life experience combined with what we have learned, our genes, our personality, our current brain states, hunger, tiredness, etc dictate how we act.
Some people don't make an effort to learn or prepare, you say it's because they didn't choose to. I say it's because it's not who they are or because they were stressed or because it didn't occur to them, or because they had something more important to do, and they don't really know why they choose what they choose.