A common aspect reocurring in these terrible incidents is the mental state of the prepetrators at the time of their crimes . A high number come across as being socially awkward and withdrawn with issues. So how do you stop the mentally ill from obtaining high powered weapons ...well the truth is you cannot Lanza was apparently intelligent very internet aware and so could have obtained guns even if his mother had twigged that he was a 'wrong un' and started to get some mental health treatment for her son. There has been a history of mass killings in the US and the world prior to violent video games but at the same time a reduction in the number of people incarcerated for serious mental health issues society deeming it necessary and acceptable to have people treated in the community using modern drugs . This has not worked ....in the end over a couple of generations the threat will melt away guns in all their forms will cease to have the allure and attraction that they currently have for many folk . People will realise that for most the the threat of violentt crime is a myth and that as the crime rate falls it simply wont be necesscary to arm youself to the teeth with military grade weapons . I remember many year ago a retired Chief privately showing me his modest 9mm semi for personal protection normal ammo kept under lock and key ....he wanted no accidental home shootings on his property, forward 25 yrs and his son was keen to show off his high powered collection of assault rifles kept in a rack in his den his own young son only feet away being imprinted by all this weaponary . Guns will become uncool and lose their appeal the assocationion with them being considered extreme and excessive due to events such as the tragedy in Newton ....but not for many a long year in the meantime you just have to hope and pray that some one close to you is not caught up in one of these life changing incidents.... BFD summed up a number of points very well but what about Gun clubs and the like I'll bet they could point out a few people who really should not be going near a gun but do and already have them . When I lived in the country a local farmer had an arsenal of weapons he should not have been trusted with a pen knife let alone a rifle such was his ragged temper ( and yes he did get into trouble ) . Guns are a huge part of US society that any change will be slow and really will only happen when times and attidudes change.....its a cultural thing ...it has started fashions come and go but I would not underestimate the power of celerbrity , I sense that many people are reevaluating their asssocation with guns and are starting to see the down side to gun ownership ...