The only way that this could happen is if the drain was restricted. Which it should not be. So this fool got what was coming to him.
I think you’re being a little tough on the guy.
I got a drainage basket in my sink and I can see the cats playing around or stepping on the thing and shutting it down from draining.
Which I will do if I go away so this does not happen to me.
Ours doesn’t drain as fast as the water coming in.
Miss Kitty has been proudly bringing in bugs every few minutes. A bit ago, she brought in a snake about 18” long and thick as a finger. Nearly dropped it in the middle of sleeping hubby.