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.

2010