Using statistics from different countries like this really proves nothing other than society in different countries have different values.

I agree completely, and made this point a primary fixture in one of the followup articles.

Prior to the 1996 law and the gun buy back, the homicide rate in Australia was 6.1 per 1,000,000 — over 4 times the rate you show today.

All modern countries saw a steep drop off in homicide rate since the mid 1990s, including the USA.

One thing I can agree with you on is that just banning guns won’t change anything, and I can’t see how a gun buy back that would make a difference is viable with the US constitution and the shear number of guns in circulation.

I agree again. This is another point I focused on in the first link above. I do think there are things we can do, though, to fix the problems we do have, if we identify those problems clearly.