A gun ban would not work in America, which is why he brought it up. The American public is already armed, really likes being armed, for the most part is not registered as being armed, actually truly believes that being disarmed is a prelude to genocide, and openly admit that they would use their arms against anyone who tried to take them.
Remember what happened when the Federal government tried to get some farmer to pay for the grazing land he was using? People several states away showed up with rifles, and they had no skin in the matter. If you tried to take their rifles, they (and many others) would try their best to kill you.
If America were full of Europeans, perhaps it would work. It isn't, so any notion of gun banning in the US is nothing more than wishful thinking at best.
The other question is a matter of scales. Mass shootings are tragic, but vanishingly rare. If you propose to ban or strictly control guns specifically in reaction to mass shootings, you haven't weighed the costs and benefits of doing so.
>actually truly believes that being disarmed is a prelude to genocide
Try, if you can, to provide an example of genocide that wasn't preceded by mass-disarmament of the targeted populace (assuming they hadn't been previously disarmed).
Other countries don't have that right enshrined in their Constitution. America does, so of course they wouldn't be hit with terrorism charges, Race doesn't matter here. You can show up to the airport with a gun, and as long as you don't threaten anyone or try to get through the security checkpoint, you won't be arrested. If you are arrested, the arrest will be thrown out of the court. Americans have the explicit right to carry guns in a not-overtly-threatening manner in a great many places that might surprise you.
My oblique point was that "not-overtly-threatening manner" is very subject to racist interpretation. There have been a number of well publicised incidents of black Americans being shot dead due to being wrongly percieved as threats, such as http://www.msnbc.com/msnbc/cops-shoot-and-kill-man-holding-t...
This actually adds a lot of nuance to the argument -- one of the reasons you can't just legislate anything is that you must take into account not only technical limitations and requirements but also the characteristics of the local population. Different cultures will respond differently to different laws.
Remember what happened when the Federal government tried to get some farmer to pay for the grazing land he was using? People several states away showed up with rifles, and they had no skin in the matter. If you tried to take their rifles, they (and many others) would try their best to kill you.
If America were full of Europeans, perhaps it would work. It isn't, so any notion of gun banning in the US is nothing more than wishful thinking at best.