https://amp.theguardian.com/us-news/2021/dec/05/republican-thomas-massie-condemned-for-christmas-guns-photo-congressman-michigan-school-shooting
Australia went the polar opposite...we disarmed the population.
The U.S. militants, Right wingers, nasties and gangland criminals will never give up their illegal guns nor will they obey future laws of responsible gun ownership. The number of guns in the US is astronomical (multi millions); the ability of a would be mass shooter to get access to destructive weapons is as easy as getting access to a cricket bat is for Australians. It's similar to the argument to abolish nuclear weapons, you can't erase the knowledge to make nuclear bombs (so they will always be there) despite one’s noble intentions to eradicate the threat of nuclear destruction.