Re: A gun is involved in every single mass shooting.
Actually a gun is NOT involved in every mass murder. IED's, poison, cars, plains, etc. are often used in mass murders.
In addition there is no law that will prevent an evil or deranged person from killing innocent bystanders. Even if you could eliminate legal sales or possession of guns, there is a huge black market for guns that are imported from Russia, the Ukraine and many other countries to the U.S. As the news has shown mass murders via guns or other methods is not unique to the U.S. unfortunately. Europe has seen it's fair share along with Asia and Australia to name a few.
Until people address the real issue which is not guns but evil, sick depraved people nothing positive will be done to lower the incident of mass murder be it at a rock concert, night club or an office environment.