okay, so you think just attaching PLCs to an rs485-to-ethernet adapter and connecting it straight unauthenticated to the internet, and then calling it a day is simply perfectly reasonable, since "well.. cant expect to harden against cyber warfare!! no defect!!!" ?

because this is the kind of stuff infrastructure things do, along with MANY other things. Im sure not all infrastructure does it, but plenty do.

This is not hardening, its BASIC security. any scriptkiddie from same country could find it and cause problems.

How far would you say they should go to stop domestic script kiddies from messing with it? and if script kiddies from other countries mess with it, is it now cyber warfare?