Mass stabbing in Canada leaves 10 dead and 15 wounded. Anti 2nd amendment proponents will tell you things like this don't/won't happen in a gun free society. This is becoming to be more false of a statement by the day. Just recently Canada bans handguns nation wide, leaving citizens at the mercy of criminals and crazy people.
Regarding gun control, a lingering fear of mine is that if they ever succeed at making private gun ownership illegal or even heavily regulated, we will graduate onto something far more gruesome like homemade explosives. Some people think bullets are bad, but that's nothing compared to the damage potential of explosives.
I don't know any anti 2nd amendment people so I can't speak to what they believe, but I know a lot of people, organizations, and studies that reflect the benefits of gun control and none of them believe there's a way to totally eradicate violence. It would, however, have a tremendous impact on the outrageous number of mass shootings, murders, and suicides we have in this country.
You (and this video) seem to be implying that this killing is similar to a mass shooting, and it is not. The murders were done in a series of separate events over time, not in a group setting all at once. Every aspect of this video is comparing apples to bananas to produce a vege salad.