They absolutely do because the guns often contain blanks. There was a great episode of What Went Wrong about this and about safety on set. There has been a huge push towards realism in gunfights, meaning blanks over sound effects and visual effects. Firing a gun obviously is far more dangerous than not firing a gun. https://podcasts.apple.com/us/podcast/what-went-wrong/id1512847066?i=1000617518180

They do, but not that scene, and they typically stop performing the scene when the director yells cut. On this day though, the scene ended, and a dude decided to play with a gun. That's just my opinion of the event though, and I haven't read anywhere near enough about it to make a real decision. From the little I did read though, he wasn't even supposed to draw the gun in that scene, and the actual shooting took place after the scene was over.

Had he accidentally pushed over a prop house while rough housing and it crushed a person, would we be blaming the carpenter? Its definitely possible, but I think goofing around and playing with weapons should never be tolerated.