A quick search gave plenty of articles saying higher education prevents war. For example "Among independents, education is highly related to support for the war. Those with only a high school education give clear majority support, but support declines as educational level increases."
"The results provide evidence
for both the grievance and stability arguments, providing strong support
for the pacifying effects of education on civil war"
> There is a modest decline in war support as educational levels increase from high school or less, to some college, to college graduate (with no postgraduate education). However, the largest gap occurs at the highest level, between those with a postgraduate education and those without. Only among the postgraduate group is the majority opposed to war, 56% to 40%, while the other three categories all show majority support.
Postgraduates almost don't count since there are so few of them in a civil society. So virtually no difference between high school level and college graduates, which does not support your point.
http://news.gallup.com/poll/7768/war-support-education-gap.a...
"The results provide evidence for both the grievance and stability arguments, providing strong support for the pacifying effects of education on civil war"
http://www.uky.edu/~clthyn2/thyne-ISQ-06.pdf