As someone's who has not only read and mined content, but has talked to people about said content, I've got to say I've learned something very important.
Personal growth absolutely must come from within. Your friends and family can provide a good support network, your hobbies might help develop your mind, and your entertainment might help you through the rough times. But in the end when it's all laid bare, you have to want it. Nobody can make you want it. And if you don't truly want to change, you'll do everything on God's green earth just to avoid even considering it.
Drakee Drake Dragonbreath swears she's a mythical dragon princess with magic powers? She's not going to listen to anyone who explains how dragons make very little evolutionary sense or how "magic" is literally something that defies the realities of nature. In her mind, all those science-y words are just TV static that can easily be turned off with phrases like "OTHER DIMENSIONS!" and "ALL THINGS ARE POSSIBLE!"
Big Bob Bloatee refuses to get a job because he figures he could just play video games as a career since that there Japanese feller's been doin' it for years? He's not going to consider your explanation of how jobs like that are exceedingly rare and they're only really specialized novelty acts, usually put on by skilled entertainers who actually put in way more hours behind the scenes than one would think. To him, you're just a naysayer, and kid cartoons taught him that naysayers are doomed to become humorous footnotes when the Super Special World-Famous Awesome People write their best-selling autobiographies.
Kinkster von Spankenstein III will never shut the fuck up about all the different fanfics he's written about women being turned into fruit and eaten by Phil Donahue in a Luffy costume? He's sure as hell not interested in anyone else's personal space or feelings of discomfort. In his universe, he's taking a bold stance by relating everything to his boner, and it's on you to find creative workarounds to avoid hearing about it. Not that you should, of course, because that'd be mean to him and his community.
Yes, you could explain to them what's wrong with their behavior. You could go on for hours about how society works, how natural laws work, how medicine works, how emotions work, how the economy works, how education works... but it's not going to mean jack shit unless that person's willing to listen. Sometimes they do. Sometimes a person considers the opposing point of view, learns a few things about themself and about the world, and they work on their faults and become better people for it. But sometimes... a lot of the fucking time, actually... they not only won't listen, but they'll be fucking infuriated at anyone who disagrees with them. They'll yell about how mean you are. They'll accuse you of trying to do something bad to them. They'll say you're sticking your head in the sand. They'll wail about how they're being totally harmless, or how they're trying so hard when they've never even tried at all, or how it's too hard and thus not worth trying anyway. Obviously miserable people will claim they're fine where they are, and obviously lonely people will say they don't actually need anyone else anyway. They'll repeat the same mistakes over and over because that's what they're used to, and the concept of changing is infinitely more terrifying than the inevitable failures that come from making poor choices. They'll plead for someone to tell them how to fix things, but won't actually consider any difficult solutions presented to them. They'll swear they always made all the right moves and that anything bad that happens is the direct result of everyone else being an idiot. It's your fault they're not where they want to be. It's their crush's fault that they're not dating anybody. It's their parents' fault for not sending them to Well-Known Manga Artist School. It's their friends' fault for not acknowledging the existence of werewolves. It's the government's fault for not making it illegal to personally offend them. It's society's fault that they come off as creepy. It's the world's fault for not tailoring itself for them and only them the moment they were born. "You can't tell me what to do because I'm perfect just the way I am."
I have gone through a lot of stupid posts on the internet. A fucking ton of them. This story repeats itself over and over and it'll repeat itself until the end of time. If you see someone drowning, you can throw them a life preserver. Just don't be too surprised if they instead use their dying breath to tell you how it's your fault the lake's even there in the first place.