Can we get what we're fighting for?

I recently read that in the known history of the world...  the WHOLE history...  there have only been 29 years in which there has been no documented wars or fighting.  29 years in the known history of the world.  Even the holy books that a lot of people live their lives by are built upon a foundation of fighting...  Is it any wonder everyone is so angry.

In Hinduism the Mahabarata is one of the two great epics, in which The Book of Effort tells us the story of the battle between brothers.  In the Qur'an 2:191 we are given permission to slay where there is opression, Christianity the bible records many wars and in fact the story of Jesus' rise and fall in itself is a war.  This has gotten me to thinking...

In the modern world, we have television, the internet, numerous daytime shat shows helping us to decide 'what is worth fighting for'.  I mean, at this moment in time we've even got Cheryl Cole reminding us that 'love' is worth fighting for.

In our careers we widely acknowledge that being good at what we do and going that extra mile wherever possible will get us to where we want to be...  we dont 'fight' with our bosses or the coporate giants, we excel at what we do, work on our weaknesses and therefore our career moves steadfastly onwards.  In personal lives we seem to want to 'fight' for everything and not bother about the hard work.

Relatonships are hard work on a massive scale, for example, the relationship between The Americas and The Middle East, relationships are also hard work on a smaller scale, for example, my boyfriend and I.  I wont disclose his name on here so we'll just refer to him as 'him' for now... We have never been in a position where we have 'fought' for one anothers attentions, oh don't get me wrong we dont by any means have a 'perfect' relationship (whatever one of those is) but even our break up for a short while a year ago was relatively controlled with a few nasty words being scattered like the landmines in the middle east, ready to spontaneously explode with no warning with complete indiscrimination as to what they destroyed...

So, my wondering is this... how do we ever decide what is worth fighting for and how do we decide if it's even worth the fight in the first place?