Hmm - more of a tirade than a question, but let's assume you sincerely want to learn. There's a good deal of ground to cover, so please bear with me here...
First, technical trail shoes are not "city shoes"
If we're going to have an intelligent conversation we need to clear this up from the outset. You describe all types of lightweight footwear as "city shoes". This is an unhelpful caricature. While street shoes are obviously inappropriate for tough walking, technical trail and approach shoes are designed specifically to provide the grip and robustness required for this type of terrain.
Second - lightweight walkers are not simply unprepared fashion victims
We have to put this in proper context. You imply that anyone using lightweight footwear on difficult ground is simply unprepared or following a mindless trend. In fact, you'll find that the more experienced the walker, the more likely that they will be choosing to use lightweight footwear.
I've been walking the hills for half a century. I've used every kind of footwear, and in almost all conditions I now have a strong preference for trail shoes. And I'm far from alone. Pretty much every experienced through-hiker is now using lightweight footwear, even on quite technical off-trail work like the Sierra High Route. In fact, I challenge you to find a single well-known long-distance walker using the kind of boot you are advocating.
So there are two possibilities. Either the entire community of long-distance walkers is experiencing some kind of collective delusion, or they know something that you are missing...
Third - the traditional case for heavy walking boots doesn't stand up to scrutiny
The specific claims you make for heavy footwear are that it protects the ankles and keeps the feet dry.
But where is your evidence that heavy boots protect the ankles? I can't find any actual research that's remotely convincing. To provide meaningful ankle support, a boot has to be so rigid that it's virtually impossible to walk in the thing. In reality, a walking boot, as against a technical ice boot, provides insignificant ankle support when laced for comfort. On the other hand the high stack height, stiff sole and poor ground feel disrupt natural walking mechanics and leave you clumsy and unstable. I experienced a number of serious ankle injuries in conventional boots. Since I switched to lightweight trail shoes I've never had a problem, and I do a lot of rough off-trail walking.
As for the idea that big boots keep the feet dry, I don't know many real walkers who'd agree. Your feet sweat, and heavy boots don't breathe. But the membranes in so-called breathable waterproof boots quickly break down and leak. And with any practical summer gaiter, water is going to penetrate through the gap at the ankle. Once they are wet, the type of boot you are advocating becomes even heavier and takes an age to dry.
The great majority of long-distance walkers simply accept that their feet will get wet at times. They chose shoes that drain well and dry quickly, and wear merino socks that are warm when wet. On balance, this is much the most successful approach.
Most long-distance walkers agree that the benefits of lightweight footwear greatly outweigh the disadvantages
The real disadvantage of lightweight trail shoes is economic - you're going to be replacing them after every 500 miles or so of heavy use. On every other dimension, they are a much better choice than the old leather monsters that you are advocating.
Trail shoes are far more energy efficient: research shows that a pound on the feet is equivalent to at least 5 lbs on the back. And on steep rough ground, that's probably an underestimate (the research was done on treadmills). Lightweight shoes are far less tiring to walk in, and you'll be significantly less prone to lower-body strain injuries.
Trail shoes are far kinder on the feet: I've walked thousands of miles in trail shoes and never had a hot spot, never mind a blister. When I walked in big boots I had endless problems with blisters and bruising. Search Google Images for "hiking blisters" and you'll see graphic evidence of the misery big boots can cause:
Trail shoes are far more nimble: you'll be significantly more balanced and less liable to fall. Falls in remote country can be serious, so this is a big deal.
Trail shoes are far better for stream crossings. Stream crossings with big boots are a major faff. With trails shoes you just walk straight across. Your feet are grippy and protected during the crossing, and the shoes soon drain on the trail.
As I say, the more experienced the walker, the more likely that they will chose lightweight shoes. And this will be a considered choice based on many thousands of miles of practical experience. You're welcome to choose the footwear you prefer - that's the freedom of the hills. But please keep an open mind and don't denigrate those who make other choices.