Statistics have shown that their is an increase in economies after people go fleeing from war. (just one point)
I would like to point out to crabbymrgood56 that Syria is not the only place where organizations such as ISIS are fighting. Their is fighting all over the place and with several different groups. Which is why 21 present of those who are fleeing to Europe are from Afghanistan.
The U.N. refugee agency says the refugees risk life and limb in unseaworthy vessels because they are "desperate" to reach Europe in their quest for protection from war, violence, and political persecution, as well as economic hardship.
At least 3,735 migrants crossing the Mediterranean Sea for Europe have died or gone missing in 2015. (also from the U.N. refugee agency)
They do all this and still face discrimination, abuse, and poor living conditions, this must tell you how much their need is to evacuate their homes.
(P.S. Again to crabbymrgood56, no one abandons their homes because things are bearable, they run because they don't want to die.)