To kill (or hurt) other human beings to protect "your" land or "your" loved ones baffles me. Yes, I love my loved ones (wow) but that doesn't mean I'm willing to kill people who are 99.99999% similar to my loved ones just because the politicians that manage the countries we happen to live in decide so.
We think that because we can send probes the the outer space or because we can do calculus we are so intelligent. We are still just monkeys who get mad when other monkeys say/do something to us that we don't like.