[insoluble]

In addition to what else has been said so far, some videos are private, and making those videos interceptable would allow unauthorised access. Moreover, YouTube is not used only for entertainment. Unlike standard television, where the content is essentially chosen and pushed to you, YouTube involves pulling specifically that content on those topics which you want personally. Also unlike standard television, a greater portion of the content is controversial, biased, or sensitive. Similar to the idea of plausible deniability, making the site HTTPS-only allows people not to feel ashamed of viewing with SSL. Otherwise, we would have the classic problem of those using encryption being seen as suspicious or shady, which would prevent people from seeking the information they truly want. In a world where all your thoughts are being monitored at all times, you have no free thought.