Guns

When I read about the shooting in Denver, that it was the worst in recent history, I was so angry.  How and why do we tolerate the ridiculous gun laws in the US?  It boggles my mind that things remain unchanged when average people aren't safe.  Mass shootings get headlines but every day there are gun-related killings that wouldn't happen if dangerous people weren't allowed to own guns!  The US is arming Mexican drug wars, and we get upset when the violence spills over the border.  Isn't there enough pain, suffering and death in the world already, without having to add to it?