Interesting topic.
What sort of statistics are you looking for?
What's your position on this issue?
Thank you. The topic isn't an original one. I've got it from reading one of the posts on ATARnotes and I was really interested. But due to my lack of knowledge in term of terrorism and stuff, and English is also my weakness. I had so much trouble in writing up my speech. I'm on the affirmative side on the issue.
As one of my arguments are going to be the safety of citizen, I was going to elaborate about the peoples senses of hatred and resentments towards the Western World. And I was thinking about a case study or any statistic/ evident which indicate the death roll of Western tourists at these countries. Or any evident which can support the idea that coming to these countries can endanger the Australians' well beings.
In term of being radicalised, I was thinking about abc12345j's suggestion about the Paris attacks. But I also would like some statistic which focus on the effects of their propaganda, perhaps the percentage which show the number of Australian Jihad whom were influenced through indoctrination.
-Another argument you could make is that by not allowing Australian citizens to travel to these nations, the Australian government would be effectively condemning these nations' draconian laws that oppress LGBT people, women etc, which would undoubtedly create international pressure and an (economic) incentive for these nations to scrap their "Jihadist rules". This is similar to and can be seen as an extension of the idea of "sanctions" on nation states (which are designed to change the behaviour of the target state).
I'll let you know if I come up with any more arguments/ideas/statistics. Good luck 
And maybe some evident which support this as well. Maybe a case study on these draconian laws and its influence/ pressure?
THANK YOU <3