Communications Minister Malcolm Turnbull addressed the Sydney Institute on terrorism last night. Judge for yourself the difference in tone and argument with Foreign Minister Julie Bishop's speech at the Sydney Institute in late April. First Turnbull:

Just as it is important not to underestimate, or be complacent about, the national security threat from Da’esh, it is equally important not to overestimate that threat. Any threat looms largest when it is close to us in either time or space - or both.

In Menzies’ day our democratic way of life was threatened by two totalitarian ideologies - Soviet Communism and fascism. Each were proselytising ideologies.  One was defeated in battle in 1945, the other expired, largely from its own contradictions, twenty five years ago. China, the last nominally communist superpower, does not seek to export its way of government.

But Da’esh is not Hitler’s Germany, Tojo’s Japan or Stalin’s Russia. Its leaders dream that they, like the Arab armies of the 7th and 8th century, will sweep across the Middle East into Europe itself. They predict that before long they will be stabling their horses in the Vatican.

Well Idi Amin wasn’t the King of Scotland either.

We should be careful not to say or do things which can be seen to add credibility to those delusions.

And here's Julie Bishop:

Tonight I will address what I see as the most significant threat to the global rules based order to emerge in the past 70 years - and included in my considerations is the rise of communism and the Cold War.

This threat is a form of terrorism - more dangerous, more complex, more global than we have witnessed before - a pernicious force that could, if left unchecked, wield great global power that would threaten the very existence of nation states.