Agreed, but it happens all the time. The IT department needs access to these systems remotely. They are usually on a LAN behind a firewall but they can still be compromised. Most of our nuclear plants have SCADA systems that are accessible on the internet and many of them still have the default passwords set on them.

Spend a few minutes searching https://www.shodan.io/ if you want to see how much crap is plugged into the internet. It's truly terrifying how vulnerable to this kind of attack we are across the world.

Woth this said, it was proven in like 2014 that cars could be hacked. I think the person that did it to orove it hacked a Jeep grand cherokee. The SUV had throttle by wire and steering by wire. The hack gave them complete control of the vehicle to operate. Roughly 2016 or 17 manufacturers started putting firewalls on ECMs to prevent this. It makes it slightly hard to buy a programmer to change parameters that would boost engine power and things of that nature. Its crazy what can be taken control of remotely nowadays.