I have a hard time imagining the US government threatening in such a tape supporting regimes with overthrow and (reluctantly) supporting leaders with murder to further their case. The line 'socialists are infidels' (a German partial transcript, however, could have been written by the US government (grin).
I am at a loss of understanding how someone having read what was said in the tape can come to the conclusion that the purpose of this tape is to make war more probable. Giving advices to the population how to fight effectively, threatening murder and bloodshed to American allies, telling how to win agaisnt the infidels is not a very effective pro war propaganda.