There are more than just "3" countries... and I wouldn't be using "businessinsider" for correct information.
There are actually 8:
Czech Republic
Guatemala
Mexico
Switzerland
The Philippines
Ukraine
United States
Yemen
https://en.wikipedia.org/wiki/Right_to_keep_and_bear_arms
Additionally, the following countries permit some different levels of gun ownership (even here in Oz):
https://en.wikipedia.org/wiki/Overview_of_gun_laws_by_nation
It's tragic to hear of others killing one another - via guns or other weapons.
Responsible gun owners aren't the problem - it's the law breaking criminals (including Hunter Biden) who obtain gun's illegally and use them without regard for others lives. I do not believe in punishing law abiding gun owners - just as I don't believe in punishing all drivers just because some of them drive drunk and cause mayhem and death - the worst of which in the USA was in May 1988 in Carrollton, Kentucky when a drunk driver hit a bus head-on and killed 27.