Might that be because, as a society, we haven't exactly rolled out the welcome mat? I'd probably retreat to an enclave if people abused me, judged me for my religion, discriminated against me on skin colour, demanded me to give up much loved traditions....
That's the thing about people like us mate, we don't experience what they experience, we're rich, employed, white, males in an environment that loves, nurtures and protects us.
We can't force these people to the fringes of society and then wonder why they get suckered into extremism.
The best tactic to subvert Islamic Terrorism is with education, awareness, ignorance intolerance and in general catching flies with honey rather than vinegar.
Whilst I know it was tongue in cheek, if Australia employed your tactic of enforcing ham sandwich eating and beer drinking then not only would we be burning the very thing that makes Australia great (freedom to be who you want to be) we would also be increasing the chances of home grown domestic terrorism - Australia has half a million Muslims already