www.melbourneinstitute.com/wp/wp2008n17.pdf
Keep in mind that the people writing this paper on the effects of the gun buybacks in Australia were trying to prove the opposite. Namely that the buybacks had succeeded in their alleged purpose of reducing gun crime.
They failed in their premise and conclude that the buybacks had no discernible effect. This of course is despite billions of dollars spent on the buybacks and huge continuuing waste of police resources, both monetary and manhours, in registration procedures.
Australia is clearly not a safer country because of the gun buybacks and anybody living in Sydney or Melbourne will tell you that.
Gang/drug wars are increasingly common, admittedly nothing like on the scale of some cities in the USA, but new to the Australian scene courtesy (to some extent) of our immigration policy.
The other thing that no published statistics will indicate as yet is the number of actual shootings in places like the UK and Australia.
I believe from anecdotal reports that there is a significant increase in these but as medical care and response times improve, survivability improves and this is reflected in reduced homicide rates. Any reduction in the latter is then claimed as a "success" by the antigun crowd.
The other factor becoming obvious in the UK and Australia is the dramatic increase in knife crime, again courtesy of our multiculturism.
However, I tend to agree with many of the earlier posters.
None of this has anything to do with 2A.
US citizens have a right to self defence and possession and carriage of firearms. That is what distinguishes you as citizens of a great republic. The rest of us are subjects of the State, relatively benevolent States in the case of the UK and Australia, but still subjects.
If your professor likes the idea of being a subject rather than a citizen, then perhaps he should be reminded that the US fought a war to be rid of the yokes of monarchy. He is of course free to leave the USA and enjoy the "safety" of walking down a London street at night, after all, they don't have any (legal) handguns any more.