Police actually intervene a lot, all the time, day and night. Not even a fraction of this ends up in the news. People seek help from police all the time as well: car crashes, fires, protecting paramedics, protecting protestors from counter-demonstrators, protecting mosques and churches, protecting asylum housing, etc. etc. etc.
It seems like you have no idea what police is actually doing and think because you don’t see it it’s not happening. But a lot of completely normal people, with jobs and housing and everything, get in trouble for various reasons and it happens all the time. Just for Berlin for example (that’s 4.7 Million people), you have about 4000 emergency calls a day. Only for the calls that go directly to the police, not even reroutes. And that’s not counting all the regular stuff going on like observations, protection programs, people who come directly to the station, patrols, …
It’s irrational to believe all this will suddenly evaporates just by giving people alternatives. That’s not how people work.