Don't be found in high crime areas in the USA and you likelihood of being threatened with a firearm by a stranger is very small.
One psycho preacher with a arrest record for public disorder preaching that god told will never be me to ____ gets a handgun into the White House; doesn't give it up and gets shot in a New York second.
Three terrorists suicide bomb the airport in Brussels, guarded by armed police (para military -- ever been in an airport in Europe these days -- I have ;) ) and murder 70+ people -- good work. Good security.
Collecting all the guns in the USA and disarming the people is like all the nuclear bombs being decommissioned and destroyed in the world -- never going to happen
Dwelling on it is pointless.