I don't know what you're trying to imply here, but TV news networks aren't the smartest people in the bunch. Anyone with an actual brain knows that if you take away easy access to guns, the rate of shootings and deaths would massively go down, but not completely down to zero since there are folks that are "smart" enough to go around loopholes and get them illegally or make their own (but that's still not close to as often as people easily walking into a store and buy a gun in the US).
In Japan, people can still get "guns", but they have to go through a very heavy multi-step procedural certification to even own/use one. However, the shooter in this case used a homemade gun if you look at actual footage and screenshots and it's not simple to make a gun and the bullets needed, so, again, the rate of shootings and such are still a lot lower than the amount of shootings the US gets.
Plus, this doesn't happen as often as you may think compared to how much shootings happens in the US.
but.. those points dont make sense. the murder rate would actually skyrocket and in fact has in countries like, mexico or el Salvador ( which is number 1 in shootings btw) where citizens can't own guns. Also im pretty sure we are around 18th overall in the world for mass shootings.