An amendment to block one sided news is rather ridiculous to think of. And the first is more important than the second, it seems, so people hold that more dearly.
Well Pat Robertson has theories.
https://www.washingtonpost.com/news/acts-of-faith/wp/2017/10/03/yes-pat-robertson-blamed-the-vegas-shooting-on-disrespect-for-trump-and-the-national-anthem/?utm_term=.32d63e874cd8
That'd require caring about others too much for the average American. Interesting article on gun control, though. The real answer though, is bullet control.
US gun ownership is pretty high and crime isn't negligible, so not sure the original meme has much for it.
Breivik sure screwed Norway's numbers up, hah.