He has not only tried to change the American gun laws but also kept his military confrontations around the world to minimum. His efforts come in vain when the war machine turns on.

An 'embarrassing' break: Dozens of State Department officials just revolted against Obama's Syria policy

http://www.businessinsider.com/state-department-officials-call-for-airstrikes-on-assad-2016-6

No matter how dangerous a nation's leader may be, s/he certainly is not as worrying as a bunch of nations' high tech militaries with their countries arms dealers hungry for profits and/or recognition.