I'm not completely convinced all of his facts are backed up, but I do agree with his sentiments. Gun control will never be an answer to violent crime, far too easy to obtain illegally. I remember my gun nut friends all had illegal assault rifles during the Clinton ban.
I agree that mental illness awareness is a much better place to spend the $500 million Obama just asked for gun control.
If you are not convinced of his facts, check the relevant websites yourself. There's a great drill-down on the statistics in this video and you can go to the same (official) websites and pull the stats yourself: https://www.youtube.com/embed/Ooa98FHuaU0
Japan isn't the same as the United States. We don't want to be the same as Japan, because to do so would be to give up what this country was built on. We have always had firearms and our constitution says we SHOULD always have firearms.
Nevermind the fact that we have millions more guns in our country -- making guns illegal after they've hit such a penetration level would be impossible.
Japan has forbidden the keeping and bearing of arms by normal subjects since 1588; the collective guilt based controls that followed during the Shogunate were sufficiently hideous that I really can't see any utility in comparing the two nations in these areas.