However the article pointed out (and it's pretty reasonable honestly) that when the woman first found the device she didn't know what it was and was concerned it might be a bomb. Given that someone has attached a device to your car without informing you of the intent of that device I think it's perfectly fair to destroy the device - if someone asks for the device returned you can explain the situation and, as long as you didn't clearly know what the device was (i.e. have search history for that exact tracker device or have testimony from a mechanic or technician who advised you on what the device is) then I think it'd be extremely difficult for you to be found at any fault.
Car bombs are a thing that happens, they happen thankfully quite rarely but destroying a suspicious device is probably the best general course of action.
Edit to add: I think there's also no reason to believe that someone planting a tracking device on your vehicle is working with law enforcement - it could easily be a stalker or someone acting maliciously. This actually seems like really risky behavior for the cops if they ever want the device back - I'd assume the devices they actually get returned are by pure luck alone.