The villains raise interesting points but Hori doesn't know any way to resolve it
The whole plot is like that.
I don't know whether it's Hori himself that walked back on a lot of things the early plot touched upon, or if it's something the editor forced on him, but MHA drops a lot of plot threads.
The alleged spy at UA? Gone. Endeavour being a rapist and abusive parent? Dropped and retconned, he gets a clunky redemption arc because heroes can't be evil. Which then brings me to Stain and his rants about heroes becoming little more than celebrities that fail at doing their job, that's minimized since all the heroes you see are selfless and valiant.
What about the fact the government cracked down on the populace so hard their spawned a fucking superpowered insurrection? Again, the plot goes nowhere with it - the rebels are crushed by government forces and their complaints are not addressed. Ditto for discrimination of people with quirks that turn them ugly or monstrous, that's also something the story goes nowhere with.
I can't really blame Hori for this though, it's a recurring trend in shonenshit. Anyone remember early Naruto where ninjas weren't ubermensch that can level cities? When they had to use deception, tactics and strategically employ their techniques to win in a fight?
How long did that last? Likely until whatever preplanned plot threads the author ran out and the pressures of needing to keep churning out chapter after chapter at a regular place forced him to default to the usual shonenshit formula.
Another issue with the formula is that it escalates far too fast. There's no room to breathe, to let the characters explore threats at their current level for a bit more, or to come up with clever uses for quirks, or quirk combinations, since there's no time come up with anything creative,, so Deku/Shoto/Bakugo just solve the problem by punching the bad guy really hard, rendering every other character, even professional heroes, utterly useless and superfluous.
No you see this random mook killed Midnight offscreen, people die in MHA! Remember Midnight? She was the horny one that didn't have grapes for hair!
I gotta ask, is Hori gay?
Midnight and Mirko were, arguably, two of the most popular female characters in the whole story, yet one gets all her limbs chopped off and the other is killed by some random mook.
I noticed something similar with JJK, nearly all the popular female characters are either killed, torn to shreds or maimed one way or the other.