Will happily flood the house if something goes wrong.
> automatic login
Frequently requires manually reentering credentials.
> automatic debit of monthly bills
Will happily send your life savings to the power company if they typo a couple of extra zeroes on your bill.
> automatic reply to emails
Notorious for massive screwups when people enable them without adequate controls, especially when multiple people on the same mailing list do it at the same time.
All of these examples seem to reinforce the idea that "automatic" does not mean "requires no human supervision."