i believe we act on urges because of both free will and the forces around us
people take in every single thing that they see hear and experience in their life and they cram it in their brain and what comes out is their personality
the consistent patterns and unique behaviors of one person that is differing them from others
you might have someone around the world that is 99% your personality but no one is 100% the same as you
free will is not created thats why its called free will not commands
what we do with the information we take in is the free will part. two kids decided to shoot up their school because they were picked on, another fact is they loved video games. so they were picked on and that gave them motivation and the video games gave them training
i was picked on a bit as a kid for my funny last name, and i love video games, and extremely violent ones are my favorite
but i have never shot up my school
the up bringing of those kids were more than satisfactory including the bullying
there is no reason other than their free will that they did this
so therefor there is a balance between nature and nurture