The cause is clear in my mind: the world outside is what it is. If you cannot take good decisions (whatever that is for you) and you need someone to get protrcted and you soend your day whining about your own problems bc the world is not perfect, then you did not become an adult, ever.
There are extreme cases: for example you cannot say aperson in a country with no weapons is infantilized bc the complain for being abused by an armed gang. Something like that is legit.
But for many things I see around I just see people complaining instead of changing strategy, solve a problem, change their choice or just plain skip things they do not want. Instrad of that they demand some kind of protection.
For a very narrow set of exceptions I would agree. For the rest, we sre just adults, we should know what to do.