Lack of bathrooms has been called tragedy of the commons in this thread, but it's not the "commons" that are the problem.
The worst 10% of society determine what we can and can't have. The "commons" aren't having public sex, shooting up drugs, or destroying the bathrooms with lack of... etiquette. The commons are victimized when these things happen and then there's eventually no choice but to shut them down unless there's willingness to crack down on the explicit problematic behavior.
You're right about who is causing the damage etc. but the 'commons' does not refer to the people; it refers to the shared resource. So a public park is the commons. And when it gets polluted with plastic rubbish etc. because externalities are not internalized that's a tragedy of the commons.
I tried to find a good term for this trend and the best I could do is "defining deviancy down" defined as "the tendency of societies to respond to destructive behaviors by lowering standards for what is permissible."
It's like a behavioral Overton window that grows downwards.
We are experiencing "changing consumer habits"
A reduction of public restrooms didn't stop the worst 10% of society from having public sex, shooting up drugs, or destroying an area with their lack of defacatory etiquette -- did it?
In places where these things were problems with public restrooms, they remain problems without public restrooms.
The 10%'ers are still doing their dastardly things. The remaining 90% of society still has the same messes to clean up (or to willfully ignore).
Nothing has been improved in this process.