I've lived here in Japan for nearly a decade now and had a couple interactions with police. None of them have been targeted, and even when I was doing something

I've lived here in Japan for nearly a decade now and had a couple interactions with police. None of them have been targeted, and even when I was doing something illegal (riding a bike with headphones in) or plausibly illegal (sitting in a park drinking alcoholic drinks with my bicycle parked next to me) they were polite to a fault and also didn't seem to care about my immigration status. Anecdotes are difficult - some people get unlucky and extrapolate their experience to something that is not statistically sound.