President Obama is responsible for the murder of many innocent civilian men, women, and children that have occurred under his drone killing program, his crowd killing program of murdering unknown people, and his sociopathic special operations mass murder program. In addition, he has embraced the practice of cyber warfare (remember stuxnet) and ramped up the US militaries development of Lethal Autonomous Weapons - weapons which use algorithms to select targets and murder them and all those who are unlucky enough to be nearby. He should be prosecuted for his crimes against humanity.
On top of the brutal and horrendous murder and destruction, what I also find disturbing is the degree to which the Obama administration has been able to delude the majority people in political power, the majority of the media, US academics, and the majority of the US population, that his murder programs are not only acceptable practice, but a preferred means of addressing problems associated with international crises.
Now, there is all but universal embrace of the notion that rather than engaging in long term comprehensive effort at promoting social justice and peace, the US government's only option is to engage in some degree of military assault in order to confront international opposition.