You shouldn’t go “pew-pew” when every shot you miss can hit an innocent bystander.
Heck, even a shot that you don’t miss, can go all the way through and hit someone totally innocent on the other side.
You seem like someone who has absolutely no understanding of firearms and ballistics.
Assuming one follows the rules of firearm safety, including know your target and what is beyond your target, there’s no risk to bystanders. This person was clearly not firing wildly. This was a 9mm from a short barrel - there’s no real danger of over penetration.