Mike Martin 
Why We Fight [PDF ebook] 

"Why are we willing to die for our countries? How can ideology persuade someone to blow themselves up?When we go to war, morality, religion and ideology often take the blame. But Mike Martin boldly argues that the opposite is true: rather than driving violence, these things help to reduce it. While we resort to ideas and values to justify or interpret warfare, something else is really propelling us towards conflict: our subconscious desires, shaped by millions of years of evolution.