[niftich]

It's an integrity issue for sites that you trust. Some people's personal trust model is such that they trust no one and nothing published on the web sways their opinion; if that's indeed true then no amount of MitM content injection is going to influence them one way or the other -- but neither is truthful content. For these people, everything on the web is 'entertainment', and none of it is 'staying informed'.

For people who do use the web to stay informed, reputation, ie. trust, matters. I might think that CNN publishes clickbait alonside real news, but I trust that CNN won't put blantaly false breaking news warnings above the fold about made-up events. Or, if I don't trust a single source in isolation, I trust that if several news outlets are posting breaking news warnings about the same event at the same time, that event must be real. How else would you find out?

In this day and age, refusing HTTPS means that the site author has done a cost-benefit analysis and decided that their content is not important enough to be verifiably originating from them, and that their reputation is not valuable enough to be protected from malicious tampering. In that case, why host a self-hosted website at all?