> Some people just want to fight. As a goal by itself.

Can you make some examples of war where fighting itself was the primary goal?

> that definition would make every action 'rational'.

As mentioned above, goals themselves are not something we can evaluate as rational or not.

But given you have a goal, you can question whether the actions you undertake to achieve that goal are rational. Let's say you want to start a family and want to buy a house. Going into a casino and throwing money into the slot machines is not a rational way to achieve it, esp. since there is plenty of information available explaining in painstaking detail that this won't work.