He's not threatening massive violence unless the Australians accommodate the demands of the radical, Old Europe style Muslim population that's growing in their midst. He's just saying that - unfortunately - such violence might eventually come to pass:

Australia faces a "London-type bombing" if relations between Muslims and the intelligence and police authorities do not improve, an influential Islamic youth leader has warned. Fadi Rahman, who runs one of Sydney's biggest youth centres at Lidcombe in the city's southwest, said overseas Islamic elements were attempting to radicalise Muslim youth with their hardline ideologies... "Most of the time they start at the local mosque in small groups - they move quickly into the garage, then people's homes. You get sucked in." He said the typical recruiter was in their 40s or 50s, "from overseas, well-educated and tapping into young people's frustrations and anger". "I think we are very similar to London," he said...

The "something" includes programs to give opportunities to Muslim youth and a "less hostile" attitude by the federal Government.... Mr Rahman brokered a deal with IBM last week under which the computer company will mentor 10 youths from the centre and offer three traineeships.

When disaffected US minority groups aren't given affirmative action style employment opportunities, the worst thing they do is vote Democratic. In Australia apparently they get radicalized by overseas jihadists and try to murder thousands of people. Root causes we suppose.

References:
* Oz faces 'London-type bombing' [news.com.au]

Previously:
* British Civil Liberties Double Plus Ungood. Militant Islam Taking Over Anyway: "We Have To Rule The Kaffir". [Videos]
* I Wish I Had An LA Times Subscription, So I Could Cancel It
* Hezbollah To Lebanon: Nice Country You Got Here... Be a Real Shame If Anything Happened To It