Someone stole my 40,000 yen in Shirakawa-go. Japan is not as safe as you think?

I hang my sling bag, jacket, and umbrella at the end of the bridge because I was taking photos. (Which I normally do because I thought it was safe) There aren’t many people yet because it was around 8:30-9:00am

After a few minutes, found out that my things weren’t there anymore. I panicked and went to the information which is like 50m away from the bridge.

Found my stuff at the closed counter. My wallet is open. Took the 40,000 yen but they left my local currency cash and all my cards.

Reported it to the police and they said they are not sure if a foreigner or a Japanese stole it.

Edit: you guys are right, I trusted too much and it was my fault for leaving my stuff