The Kia/Hyundai "challenge" where people were stealing their cars with a USB cord is because they opted not to include an immobilizer in US models for a decade. Every other car brand had them as standard. Kia even had them as standard in non US cars, but because the USA stupidly does not have a law about it, they opted to drastically reduce car security to save a few dollars per car.

This has made them prime targets, as people know they make bad security choices whenever they can save a buck.

So a bit of both, I expect.