So hypothetically if guns were totally banned in the US, that would be a useless way to minimise a tragedy like newton happing again?
Logic alone says that's not true.
Next time some rock star or actor OD's, tell your friends and coworkers that the tragedy wouldn't have happened if only the US had the courage to ban coke, meth, and heroin, and capture their reactions on your smartphone.
If we banned guns, we might drop from about 300 million in circulation to 250 million, or we might not. Chicago banned guns for 28 years, until the Supreme Court recently struck it down, and had daily shootings the whole time. More Americans were getting shot in Chicago than in Afghanistan.
And of course, as always, gun bans are mainly an excuse to throw black men in jail when the cops can't find anything else on them.