Instead of fixing swiss cheese cars, maybe try catching and punishing the criminals. Just because i hold my phone in my hand and not in a locked safe doesn't mean you can take it.
Because this is not an easy crime to catch or punish, these cars are so easy to steal a layman can do it in minutes without making much noise, take it to a chop shop, and be off with some money in no time.
Getting better at identifying and shutting down these chop shops is a good idea obviously, but that's also hard. On the other hand, forcing companies who didn't give a shit about security for years to pay for retrofitting the shitty cars they put out is actually a lot easier.
