https://www.youtube.com/watch?v=RolEI5n4Jxs

Note in particular the section from 4:10 - 5:11 and tell me how he's wrong.

tl;dw
When people say, "This is not about guns, this is about terrorism." No! It's about terrorism, and it's about guns ... Just because there's a problem with terrorism doesn't mean there isn't also a problem with access to guns.