Yes, I do believe that. Most of the radicals are formed in Sydney's and Melbourne's street gang cultures, and through living room and internet preachers, and out of boxing/MMA gyms where some angry young men gather.
I believe mosques should be allowed, out in the open for all to see, and any radical preaching dealt with accordingly. There is nothing unusual about this view, it is also the view of Abbott and much of the sensible right.