You can’t guarantee who / what is on the other side.
4 rules of gun safety
Treat All Guns as if They Are Loaded: Never assume a firearm is unloaded, even if you think it is. When handling, immediately check the chamber, receiver, and magazine to confirm it is empty.
Keep the Muzzle Pointed in a Safe Direction: Never point a firearm at anything you are not willing to destroy. Control the direction of the muzzle, ensuring it is safe, even if you stumble or fall.
Keep Your Finger Off the Trigger Until Ready to Shoot: Keep your finger straight along the frame or outside the trigger guard until your sights are on the target and you have made the decision to fire.
Be Certain of Your Target and What’s Beyond It: Positively identify your target and ensure there is an adequate backstop. Bullets can pass through targets or ricochet, so know what lies beyond.
Don’t shoot through the door.
4 rules of gun safety