Car Hacking Vs Encryption Back Doors

Here is a great question; if the FBI is so concerned about vehicle hacking (and we should all be), why are they pushing for encryption backdoors - which would surely make things much easier for potential car hackers?

So asks a timely Motherboard article.
...the National Highway Traffic Safety Administration, which is responsible for regulating motor safety standards, has launched an initiative to specifically address the threats to vehicular cybersecurity. The FBI also included a number of its own safety recommendations to promote motorist safety, such as regularly checking for software updates for your car, avoiding unauthorized software modifications, and using discretion when connecting third-party devices to your car.