A train station in Germany proposes to discourage pissing on a wall by making streams of liquid bounce back.

I sympathize with those who want to discourage pissing on these walls, but I have to wonder why so many people piss there. Does the train station have toilets? If so, why don't homeless people use them? Is there some obstacle?

A person in Germany confirmed that pay toilets are the usual in Germany, and that's why people piss on walls. Instead of spending lots of money on piss-reflecting surfaces, they should spend it on giving people a proper place to use the toilet.