You're not angry with the airline for delaying a whole plane full of people just to prove a completely stupid and petty point to one passenger who made the mistake of having a full bladder?
I have been on a plane which had a bomb threat note found in the air and after landing our flight/passengers/crew were quarantine for 4 hrs in an empty terminal at MSY.
So NO from a safety perspective - I'd rather the airline prevent a hiccup in the air as we have witness in a few planes taken out of the sky in Europe/Asia! I'm not mad as crew typically secures & locks the restroom after full check prior to take-off and landing. Either passengers knew how to unlock or flight attendant didn't do their job but I'd argue if this guy was 'profile' as a threat - would you have a problem with it returning to its gate?