Yeah so that my Grandma who had Comcast install her router should definitely be legally culpable when there is a firmware issue with the router, or when the installer sets up a weak password (or none at all). I think you are probably speaking from a tech support perspective where you have had to fix systems that haven't been patched for years and that caused issues. Well, most of the population would be screwed by laws like this thru no fault of their own.

Yes, let's make non tech savvy people liable for keeping track of zero day exploits. While it might make some people more aware, I think in large part it would just push people off of the internet.