I think most Leftists fear greatly that true Liberals are right in stating that there is evil in the world. They fear this possibility, and so it becomes emotionally easier for them to fear, through hatred and violence, true Liberals. They prefer attacking the messenger to evaluating the message.
With respect to war, it is clearly sometimes necessary. At the same time, there has been an unchecked gathering of power by a military-industrial complex, which has gained unwarranted influence. Just look at Syria. Some conglomeration of forces put forth the word that Syria IS a national security interest, and our actual, physical border into our actual, physical nation, is NOT a national security interest.
That be some fucked up shit, y’all (if I might sardonically reference my previous post.)