We fight when we learn or realise that there is some sort of reward coming out of it. When we do not get what we want we fight and either get it or get some sort of self satisfaction from it. Basically we are all animals and instinct is there to fight but civilisation has taught us and made it so that it is a better reward to look for other options. Sometimes we cannot resist the urge. That's why we say we were weak when we do not think of other ways to settle disputes.
haha on the pirates..Jack Sparrow: "Let us not dear friends forget our dear freinds the cuddlefish. Pen to of them together and they will devour each other without a second thought. Human nature is'nt it? or fish nature. "
well.... honestly ? we fight because were shitty with the world and how horrible it is .. so we take it out on everyone else.. especially the people we love
because they dont know how to control their anger
because my friend it is human nature
we are violent animals
because they can!