Well well, guess who could easily spoof that one.
> A certificate authority's digital imprimatur implied something substantial about the credibility of a site, however imperfect the process.
Not just the process. SSL downplay attacks and lack of certificate pinning already existed back in those days.
As long as those attacks are unknown you may still be reasonably secure against a MITM from a banana state government or a random ISP.
Also, lets not forget that running your entire website on HTTPS was expensive on resources before the 10s.
So the argument "because we can" makes sense. That doesn't mean all that information has to be encrypted. However, if you want to harm a surveillance state, then one act is causing significant noise. Uninteresting, encrypted data is noise and potentially yields plausible deniability.
The other argument is "because we have to". Different attacks have been demonstrated on that one: hostile networks such as ISPs injecting ads, hijacking DNS, open WiFi, impersonating fraudulent websites are just a few examples.