Why do I trust the host at the far end of the connection more than those in the middle? In fact HTTPS has done little to prevent any of the things you mention, especially through e.g. ad networks.

I wouldn't mind if they were to "throw in some porn for the lulz", but that has never happened for me...

The point is that for this sort of web use, my brain is already turned on, and there's nothing at risk. If someone rewrites a page to mislead me, I'll notice eventually, whether that someone is running a TLS site or MitMing a non-TLS site.

ps. your first sentence is pretty obnoxious; there's no need to personalize this.