Adults Are Useless

So, I get that the Adults Are Useless trope is about adults being unhelpful to the youth or incompetent in any other way, but what really struck me and something I don't get about the trope is that in the description it says that Teens Are Monsters is an inversion of this trope. How is that so? Teenagers and adults are two different age groups, and an Inverted Trope is a trope that's played in reverse. A trope about adults being protective of the youth is what a real inversion of the trope would be, but how does Teens Are Monsters play an inverse role to Adults Are Useless? It's the same idea, just a different age group and less authority. The only possible correlation I can see is adults being unhelpful in situations where teenagers are misbehaving because said teens are growing up and no longer in that childhood stage of development, so teens doing things that younger children would get punished for would increasingly become the norm as part of the process of maturing. Another flip side could be that children will lose their innocence upon becoming a teenager and face many challenges that wouldn't befall younger kids, and so they start becoming cynical and that all manifests in teenagers being Foils to children and mini-adults who the actual adults become less sympathetic to and let them get away with things they wouldn't let children get away with. Thus, children are naive and vulnerable and think that teenagers are in the same line as them simply for not being adults yet, and that all potentially creates an inverse? Perhaps I'm looking too deeply into this, but....

The second thing that struck me is how on the Playing With page for Adults Are Useless, it constantly cites unspecified "monsters" in its examples, and I wanna know what/whom specifically they're referring to. It says stuff like "The monsters can only be seen by children" and "The monsters can only be harmed by children", which sort of gives me the impression that it's referring to the childhood phobia of monsters under your bed or in your closet. Could this possibly be in reference to the Teens Are Monsters trope and be correlating that trope with the aforementioned monster under the bed metaphor to highlight the foil between teens and children? It doesn't cite Teens Are Monsters on the actual Playing With page, however it does cite Teenage Wasteland which is often shown to overlap.

Just take Teens Are Monsters off the page. It's really... unrelated.

Okay, I've removed its mention on the page, but I'm still confused as to what the "monster" stuff on the Playing With page means. What are the specifics?

Monster is pretty much a synonym for "asshole".

I don't see how only children can see/harm the 'monsters'.... Adults and older kids encounter assholish people everyday, and they sure as Hell can get into fights with them. Maybe it's saying that only children can manipulate and harm older people because they have a sense of cuteness and innocence that can manipulate others in ways that an adult or teenager doesn't have?

We have the trope Invisible to Adults.

Now you see the problem?

Yes, now I'm aware.