Horowitz sums up the left
In a response to Jacob Heilbrunn at FrontPage Magazine, David Horowitz provides a succinct and useful summary of the agenda and influence of the contemporary American left. The most interesting part of the article is the first six or so paragraphs of Horowitz’s response, where he explains how the left no longer believes in anything positive, but still has the same revolutionary passions as before, which it now directs toward wholly destructive and nihilistic ends. Central to the left’s negative program is its view of America and American power as the chief source of social injustice in the world, which leads it to do everything it can to diminish American power and harm the American nation.
I find this a cogent explanation of the seemingly irrational motives of today’s left. As Polonius says about Hamlet, “Though this be madness, yet there is method in’t.” In other words, though the left’s behavior is objectively nuts, it has an intelligible structure.