Yellow stains on the toilet seat

This morning again I found on a bathroom seat, some yellow stain. I have an idea about who did this. This person knows before doing #1 into the bowl, he has to put the seat up. But somehow he sometimes doesn't do it---maybe out of laziness or being tired.
Then I thought about this: We have rules in our human society. But what are those rules for? Rules are not for the sake of the rules, but it is to serve people's benefit. In other words, the rules are the expression of our love and care for the other people.
But somehow people may have forgotten about this and rules just became rules to follow. Those who follow the rules are generally considered as good, and those who don't follow the rules are considered bad. We start judging people by the rules, and rules became the burden to the people. And nobody pay attention to why these rules came out. It was love why rules came out, but we don't focus on developing love through observing the rules. This is kinda sad situation.
In order to encourage someone who doesn't want to follow the rule, it may not be an effective way to just scold and enforce the rule, but we may need to appeal to his/her conscience by letting him/her remind of where the rules came from.