I, personally, do not and will not keep a gun in my house; they're dangerous and prone to escalation. I believe our national system of gun control is a mess, and things like extended clips and full auto conversion clips should be flat-out outlawed, and we need a simple-as-possible national no-guns list to try to keep madmen from buying them. It's altogether too easy for the wrong person to buy guns, and having a gun makes it so easy for one person to kill another, I think it's in the nation's best interest to limit that as much as possible.
However, I also recognize that guns are a backbone of this society. Like it or not, the Second Amendment (and subsequent judicial clarifications) exists. I do plan (finances willing) to take a class on firearm use and safety, because you never know. If I'm nearby while a crazed gunman gets taken down, for example, I don't want to be That Guy who doesn't know where the safety is, or how to eject a shell from a semi-auto.
As for the Denver movie theater guy, it will be interesting to see where he got his gun (or guns), and considering the high-profile massive fails that were the Columbine kids (who used a straw purchase) and the Virginia Tech shooter (who bought his guns despite being insane). If that really was him on Reddit, he just bought it recently, and for this specific purpose, and my research shows that most spree killers either bought their guns themselves, or stole them from someone who did (the exception being Jeffrey Weise, the Native American kid from Minnesota, who stole his from his grandfather, a tribal policeman). We'll see if this incident elevates the election year gun control national discussion. I hope it does.