Yes, but my point is that if you feel it's justified for your own network then you ought to expect every other network operator will feel that way about their network too.
So before applying that mentality, it would be wise to consider what your experience would be like if all your neighbours, friends, colleagues etc also did that on their networks.
Is the point that I sometimes use these networks? Then I somewhat agree - I would set up a separate guest network without shenanigans for guests to use. This avoids both the ethical sketchiness and having to explain why their web browser is shouting at them
True, that could be a good compromise. Although there are still some disadvantages like creating an SPoF for yourself and increasing your attack surface (e.g. anyone who compromises your internal CA has access to all your encrypted connections)
I have no problem with that: if my workplace MITMs traffic, I’ll use my cellphone connection and a personal laptop for sensitive data. If a friend’s house mitms traffic, same deal.
So before applying that mentality, it would be wise to consider what your experience would be like if all your neighbours, friends, colleagues etc also did that on their networks.