They left the car unlocked in the same sense that your home is unlocked. With the right tools, it’ll take me 5 minutes to gain entry. I could then claim that it’s your own fault I gained entry because you don’t have a metal enforced door, steel bars across windows, and a lock that can’t be easily or Hardily picked...

Yes, someone technically minded with the right tools and access can break in. But that’s less than 5% of the population, very similar to the percentage who could easily pick even a complicated lock, but Of cause near 90% will be able to take an ax to a door or kick in a window.