I watched the whole thing.

Well . . . . he is preaching to the gun culture choirs. These would be;

1 - People who actually hunt with guns.
2 - People who target shoot.
3 - People who have guns for personal justification.

NO mention of the culture of gun owners who use guns for (crimes) - these are your drug lords , gang bangers , Thuds , robbers , and just plain murderers. <-- they are NOT insane. However are the reason for the bulk of US gun deaths.

He keeps talking about it is not a GUN issue but rather a insane issue <-- wrong on both counts.

The real issue is;
The wrong people are getting guns far far to easy and this includes the insane people too. So we have to take the murder tool of choice away = well at lease make it more difficult to get that tool.