Too high.
I think NK transit system is incomparably safer and cleaner than BART.
Riding without a ticket? Jail.
Littering on the platform? Straight to jail, right away!
Doing any violent crime in NK transit? Believe it or not - death by firing squad.
Here is a quick overview of how the system works: https://youtu.be/eiyfwZVAzGw?si=CnOMa8F6NkiyhifE