What is it with the anti-gun folk and this statement? They use it a lot.
It is called "the big lie". It is a propaganda tactic, usually credited to Joseph Goebbels, the head of the Nazi propaganda ministry. I doubt that he invented the concept, but he did make very effective use of it, and showed others how to do the same.
Basically what the "Big Lie" tactic is, is to tell a lie, tell a big lie, and keep telling it over and over, and over. Do not allow any discussion about it. Ignore any who want to discuss it. Never allow conflicting data to be presented. Ridicule those who oppose. Never stray from the mantra. Keep telling it, over and over, and over time, people will come to first accept it, then actually firmly believe it is the truth.
Does this sound familiar?
IT works best when the propaganda ministry has control of the media. This control can be either forced, or voluntary, it doesn matter to the process, or to the effectiveness of the Big Lie. Get the message out, all the time, everywhere, and people will come to believe it over time.
Want to see it in action? Turn on the TV.....