The edifice of government towers over public life. It is built for fighting systems, groups and "Isms'" and it can be used to ban guns, lock up the mentally ill or launch another one of its incessant public education campaigns. Its ability to stop an individual bent on causing harm to other individuals is highly limited at best.That's (formerly) Great Britain.
That is where the illusion of control breaks down. The system can promise to stop gun violence, but it can't stop a man with a gun. All it can do is exploit the tragedy for more power. Only individuals can stop individuals. The only control we can possibly have comes from living in a society where the people do the right thing... and are empowered to do the right thing.
But that is not the society that the gun-controllers and police-staters want to create. The society they want is a place where everyone sits quietly, offers no resistance, contacts the authorities and waits for the accredited branches of the government to do something. A place where everyone knows that if they do something, they may be arrested or sued by the criminal afterward. A place where people are expected to be willing to die, but not fight back.