Nobody claimed it was. Stop making things up.
With a small allowance for shorthand, yes they were. People are claiming that the SSH "notify on key-change" model, a.k.a. the self-signed cert model of security, is sufficiently secure to build into web browsers. And if it's built in, Joe Public will be using it, because he's using a tool which supports it. And having a security mode in a consumer product, used for banking or shopping, which does not have sufficient security for those activities is foolish.
I have not "changed the meaning of your sentence entirely". You said you didn't care if Joe Public could tell the difference between two situations, one of which involved them being MITMed, and the other of them involved them not being MITMed. I interpreted this as you not caring if Joe was MITMed. That does not seem like an unreasonable inference. If you don't care if he can tell if he's being MITMed, then you must not care if it happens to him.
I'm sorry you don't rate the quality of my argument. All I can say is that I and a large number of fairly bright people at Mozilla have spent quite a long time thinking about this, and come under regular pressure to make these sort of changes, with people advocating all sorts of reasons. We have heard and considered all the arguments, pretty much. And the case for making this change in consumer-facing browsers just doesn't stack up.
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