I think it can be summed up in one old but very relevant-in-our-times quote: "Those who give up freedom for security deserve neither."
At first, the idea that something is being done "for your safety and security" sounds good, but like all utopian goals, it has deeper connotations that are truly dystopian.
As mentioned in another of the comments here, this is yet another instance of companies using the "more secure" argument to gain control over the masses and ostracise anything they don't like. They're harnessing fear and exploiting it to their advantage.
To give an analogy in the real world, we don't lock ourselves in bulletproof cages and expend great efforts in hiding from others (for the most part), and I'm sure if your car's GPS indicated locations with high crime rates as "not safe" and prevented you from going there, there would be much outrage. We shouldn't let companies and (and try very hard, unfortunately not always succeeding for) governments dictate every detail of how we should live our lives offline, and the same should apply online.
There's a very long tail of sites, many sadly disappearing from Google[1], of old yet extremely useful information, which are probably going to stay HTTP for the forseeable future. I made a comment about this in a previous "HTTP/S debate" article:
https://news.ycombinator.com/item?id=14751540
Fortunately the only good thing that may come of this is that people will just start completely ignoring "not secure".
And I have JS off by default and whitelisted on a very small number of sites, if you were wondering...