You can take away guns from people. Australia did it successfully resulting in significant drop in gun violence.But you can't change it now, like no practical way to take guns away from people
You can't go the Japan way, so only way out now is more guns so people with guns can protect themselves against the bad guys
It's deterence
Are Australia's gun laws the solution for the US?
Australia is often touted as a success story in stopping gun violence after a 1996 massacre.
www.bbc.com