The dynamic has changed too. Improved security means you cant just hotwire them anymore, you either tow or need the keys. And the two main ways to get keys are burglary and deception based theft like this.

Unless they put a gun to you or knife, i dont get how this happens. Its standard advice for testdrives for the owner to hold onto the keys until sat in passenger seat, then again not get out of car until the guy arrives back and steps out.