Defilers of public washrooms. I've been doing a lot of travel recently. I have an ostomy so I haven't had to "sit down" in a bathroom for several years but for decades before that I did have to do that frequently due to a chronic illness. Travel then was a sheer nightmare of filthy bathroom after filthy bathroom. I still feel anger on behalf of others like me or people traveling with small children etc.
The people that basically destroy toilet stalls are the worst. I walked into a stall yesterday and it was soaked from one end to the other including all over the seat, etc. There was so much on the floor it was obvious this was intentional.
Why? What kind of monster did this?
That same trip I went into a bathroom and every stall was inexplicably filled with guys just hanging out. There was a bunch of them all getting changed or something. I waited 15 minutes before giving up. I had nothing better to do since every flight is basically delayed now. I know there's really nowhere else to get changed in an airport but maybe, you know, go two at a time. Other people exist.
Anyway, people who are just cruel in an anonymous, nihlist way. That's it.
Just my opinion but you can teach children not to do this.
You patiently but firmly get them to clean it up when they do it. They don't get to do anything else until it's done. They will stop doing it.
You don't do it if they were panicked, half asleep, or not feeling well and if they need help doing it, you help, but you don't just let them walk away from it if it happened in the normal course of events (and yelling "you peed everywhere again" doesn't count).
This is the kind of thing you have to do. It's easier to just yell at them and clean it yourself. It's actually much easier.