> it's meant to infantilize them
There are a few assumptions embedded within this statement.
Firstly, you assume that 'they' have an intent other than the stated one, without explaining who 'they' may be, why 'they' would want to do this, and that 'they' have managed to be the only large group of humans to ever keep a secret successfully.
Secondly, you imply that 'being infantalized' would somehow be harmful to you, and that it might reduce your ability to care for yourself.
I suspect that as a relatively young person you've realized that you are an adult, but not what that actually means yet. It means that YOU get to help decide what being an adult means, and how other adults should be judged.
If living an isolated life brings you joy somehow, that's fine. We aren't all wired the same. However, the rest of us are starting to realize it doesn't have to be that way, and as your fellow adults we don't have to do it the same way our largely miserable, broken, and frightened grandparents did.