Exactly... And the very fact that even people don't see anything wrong with "autonomous cars", probably "because this time the company in charge is going to create a separate network whis is really secure" is precisely part of the problem.
We live in a world were people who are supposed to be smart enough to program all these machines and set up all these infrastructure are thinking: "Nothing can ever go wrong with this".
As a result we have more and more insecurity and the problem is only going to get worse.
And I've got a bridge to sell to people who think that autonomous are never going to get hacked...