Learned something new today — did not know about “no paper in the toilet” people.
In a traffic jam I would not worry as much about my own safety, thinking (hoping) it’s unlikely to get murdered with other people all around. That may change as I get older and feel more vulnerable.
I’m more compassionate with children and older people and would probably help them out, but it would depend on how they presented. As to setting a precedence for others to follow, I would tell them nicely we were headed back home and tanks are now full. Sorry.
The question reminds me that when cycling long distances in large groups, it was common to stop on side of isolated road and have a potty break. I was shocked the first time I saw women relieve themselves right along side of men, but it quickly becomes normal. Same thing happened before start of a marathon when portable toilet lines were too long. It’s nature, not a big deal.