There's more as well. I don't know if I'd go so far as the bonus thing for teachers who get trained and licensed for conceal-to-carry, but the argument about how criminals and psycho's target areas and sites that ban weapons certainly is an intriguing point. We might not know if it was a factor in the Connecticut shooting and may never know, but it would be interesting to see any proof that could validate the argument.
What's "fooling the gullible" is the notion that any proposal by either side is going to cause a meaningful reduction or increase in these mass shootings. What's also "fooling the gullible" is the notion that reducing these mass shootings is the most important thing.
Really this event is just being used as a bugaboo or a tool to pass some sort of broader-reaching gun legislation than can help reduce the thousands of commonplace gun murders every year. In this regard, you're correct that assault rifles aren't being used in the most homicides, it's handguns. But you take in slack on the rope when you can get it, I suppose.