There are several campaigns that argue that this is what is causing the proliferation of mass murders.
Sort of says it all, really.
Mass murderers have been famous throughout history (by at least one reasonable definition, most of "history" is defined as a list of who killed who). But in 1962 the most effective weapon you could find to perform one was a bolt action hunting rifle, breech loading shotgun, or plausibly a six-shot revolver that took 90+ seconds to reload. Now you run to the corner store and get equipment that can deliver a hundred rounds in a minute. Arguing that this simple issue of equipment technology and availability is not at least part of the problem seems ridiculous on its face.
Here’s a 1964 ad for a commercial AR-15 model: https://www.ebay.com/itm/403353839122
Also, a six shot revolver can be reloaded in seconds using a speed loader; basically, a piece of plastic that holds six rounds of ammunition in the right position to drop directly into the cylinder.
Police officers commonly carried them.
Specifically, M-1 Carbines, which are all gone now from that program. My understanding is they're the easy-to-shoot, high-capacity magazine-fed predecessor to the AR-15.
And, Georgelemental clearly labeled what he said as his "perception". It seems a bit unreasonable to ask for a source for something as weak as a perception. (And, adding more question marks doesn't make it any more reasonable.)
He really did seem to be maximizing attention more than anything else.
This last guy they made a big deal about was literally a jew (mother was a jew, he attended a synagogue etc) by the way. They say Hitler was a jew so I guess that's how you can tell the real Nazis apart from normal homophobes. /s