A man entered a Walmart with a gun on his hip. He wasn't the only one, many others were carrying theirs concealed. He bought his groceries, then went home. Safe, because he moved around in a relatively safe area. But there was always the risk of a threat to his person, one never knows, so he exercised his universal right to protect himself by carrying a weapon just in case something happens.
He couldn't know if a potential attacker or robber may be muscular and able to overpower him, hence wearing a gun levels the playing field. It makes perfect sense, because as the saying goes, a lot can go wrong in the 10 minutes before the cops arrive. You're your own first responder.
Gun lovers will point out there is nothing wrong with carrying a weapon in public, while others opposed to guns will claim in case of violence, other people would be able to assist and bring an attacker under control, especially when a country does not allow guns. No guns equal no shootings, and it takes far more guts to stab someone compared to shooting him. There are as many people resisting guns as there are that loves guns. Both makes valid points.
As imaginary devil's advocate I decided to look at the other side of the fenced-in walls, just to make a valid observation that has its merits too.
