What is it about "War" that is so irresistable?

Here are some of the reasons why humans engage in war, good and bad, that I can think of:

  • To thwart threats to our beliefs, rights and possessions
  • To acquire something we don't have.
  • To assure liberty and justice for all.
  • To spread an idea.
  • To amass power and wealth
  • To exact revenge
  • To save heathens
  • To plunder and steal
  • To get to fight.