I guess you missed the "takes a position, from anywhere" part. I don't blame you though. If I were more concerned about getting rid of guns by any means, regardless of the best overall outcome for everyone now and in the future, I'd be able to "accidentally" leave out key points that cancel out my remarks too.
The knife attack article meant nothing in terms of like for like. It simply proves if someone can't just buy one, or some guns, to kill a bunch of people, they can very well use other harmful objects, and can group up and conspire if need be. If someone decides their going to do whatever they have to do, to hurt a bunch of innocent people, trying to stop it is almost impossible. You can try and put as many roadblocks in the way as possible, while slowly but surely, taking away you and everybody else's freedoms, and it may or may not do anything in the grand scheme of things.
Ever asked yourself how many people who are "saved" or "spared" at a mass shooting, end up dying anyway within a couple days? Did any of them have a heart attack and die in bed? Did anyone get in a car accident the next day and die? Was that extra day or two of life for that one person, worth 325 million American's rights and freedoms? I'm not saying life isn't worth saving, but nobody pays a million dollars for a Honda Civic, because it just doesn't make sense. That Honda has a value, much lower, and that's what people pay because that's what the overall market says it's worth. Tell that to a hardcore Honda fan though, and they may very well think your a bit of a jerk.
Ever wonder why when terrorists have hostages, the Government doesn't just pay to save their lives? It's because when they are told it's going to cost 1 million per person, the Government runs the numbers and decides, those people are Honda's, not Ferrari's, it's too much...