Twenty-first century war adds new risks: more and more often there are no front lines, no central command, no rules of engagement - only a chaotic collision of politics, power, faith and bloodlust. Victims are as likely to be civilians as soldiers.
There are very interesting books about these events, for instance one by a very well-known American historian named William R. Polk called Violent Politics. It's a record of what are basically guerrilla wars from the American Revolution right up through the wars in Afghanistan and Iraq.
... dizzy with the elevation to which the assassination [of Lincoln] has raised him.
Referring to President Andrew Johnson:
The tone of political assessment has changed. And honestly, the battle for the hearts and minds of the American people has taken on a bit more of a violent and narrow approach.
Kim Jong-un's style is more suggestive of Saddam Hussein or his murderous son, Uday Hussein.
I am deeply disturbed by the senseless violence instigated by some leaders in pursuit of their personal political agenda.
I think the president's comfortable with a certain level of violence.
Using terrorism or jihadists or extremists for any political agenda is immoral.