Why are we here ? What are we fighting for ?

I slipped into this ... 'thinking' mood again recently and as I was watching tv ( London bombers thing ) it just ticked ... I mean .. All these wars, conflitcs and stuff like that aren't caused by our will to survive .. but more like our will to propagate our 'philosophies' ... and to protect them ... If I had to bring some examples up ... It could be ... war on Iraq ( although it wasn't purely the cause of democracy. Bush still coud still use it as a cover for other reasons which I won't go in detail. ) . and the london bombings ( which is in the case to protect and in some way propagate the idealogy ). These 'philosophies' were born to make this world a better place ... But I can't quite understand how people can 'transform' those 'good' idealogies into idealogies that destroy life ... Maybe I am trying to understand something which is far beyond my reach ... Yeah ... I think i've rambled enough ... It's ok if you dont get what I mean .. but it's just a thing that struck me ...

Peace ...