It's the Netherlands. Not sure whether Belgium is equally bad or not, but probably close.
"Smash and grab" is a good term for what happens here, mostly in parking garages. Thieves just take whatever they find and only check later whether what they stole has any use or value to them. I read a sad story about a professional (convertor) accordion stolen from a car, along with a laptop. The thieves were on a moped or motorbike and quickly got tired of carrying the heavy accordion. They threw it in the ditch (which was filled with water) and continued on their way with just the laptop. They obviously didn't know the accordion was worth an order of magnitude more than the laptop. (Was, because after the accordion was found and retrieved it was completely soaked and a total loss.
The other problem with cars is mostly when parked on the street or on people's driveway. High-end mirrors (with cameras and motors) and headlights (each worth several thousand) are commonly stolen (carefully removed and not smashed) and catalytic convertors are removed using an angle grinder. They are worth a lot because of the platinum they contain.
Accordions are also stolen on trains, on the platform (of a station), and before or after concerts.