i think that last point of zeuhls is the most telling. Shortly after the most recent spree killing in Newtown, an argument over guns and gun control started up in a barbers shop - culminating in one of the people in the argument becoming so enraged that they ran out to their car, drew out their handgun and sprayed the barbers shop with bullets. Fortunately, no one was killed or injured in that particular event.
http://www.salon.com/2012/12/20/argument_over_newtown_leads_to_shooting_in_wentzville_barber_shop/
Clanad talks about an increase in murder rates in the UK, using bladed weapons, then asks if we are prepared to ban all steak knives - but this is a little disingenuous. It is far more difficult to carry out a spree killing of multiple targets,as a a recent story from China made very clear
http://www.nydailynews.com/news/national/man-attacks-22-kids-knife-china-school-article-1.1220230
A crazed individual goes off on one in a school. The difference here though is very marked - despite going wild, causing many injuries - 22 kids and 1 adult - there were no fatalities. Now compare that to the crazed individual in Newtown = 27 odd fatalities?, most recipients of multiple gunshots.
Meanwhile, in the USA, the death toll from firearms continues to rise, inexorably - 1400 or so in the few short weeks since the Newtown massacre.
http://www.slate.com/articles/news_and_politics/crime/2012/12/gun_death_tally_every_american_gun_death_since_newtown_sandy_hook_shooting.html
As others have stated here, the 2nd amendment was written in a time where it was envisioned that a citizen militia might be needed to throw off an oppressive government - Is it still really necessary now?
Even the bible gets updated once in a blue moon - perhaps the constitution might need a review once in a while?
http://civilliberty.about.com/od/guncontrol/i/2ndamendment.htm