I hate "interview" articles. They show laziness and a lack of skill on the part of the writer, and they take forever to get to the point.
You should begin reading from the part when Horowitz enters the debate.
As a (retired) writer/editor, I often used the interview as , like I think this exchange does, it puts the actual words of the lamebrain out there for everyone to see. It then can't be refuted as the writer misinterpreting or misrepresenting.
This is particularly effective when the interviewer is as astute as Horowitz. (He allowed Beinart enough room to hoist himself on his own petard... and provided great fodder for future illustrative use.)
i.e., Beinart's own words can be the best weapon against the lib/socialists in future confrontations.
BTW, I always couple "lib" with 'socialist' - "lib/socialists" for a trigger association in peoples minds.