You are oversimplifying things. It sort of overlaps some of the vaccine requirement arguments or perhaps laws that require you lock up your guns. Not updating devices that are connected to the net can and does lead to vulnerabilities that allow huge botnets to be created and deployed against anyone else on the network.

I say do what you want with your equipment if it isn't connected to the web. But if it is, you need to have some responsibility for it being used to harm others.