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The multiple references to 
being killed by Israel make me think it's mostly Candice Owens viewers, mixed in with some Nick Fuentes fans. The Greta Thunberg reference is valid, at least. Link to song: https://www.youtube.com/watch?v=2bEZQ00OOxY
Other versions of the song have even worse comments: "He inhaled 6 million powerups in how short a time?" "He only could've inhaled like 200000 at most." "271k to be exact" - https://www.youtube.com/watch?v=_N6WJ9XZk2Y
"219k views? In just three years? Yeah, sounds about right." https://www.youtube.com/watch?v=uH1LTFeYWwU
Your last point doesn't really square up. People aren't born perfect because God; actually people are born in a fallen state and only forgiven of their original sin via baptism.
Anyway, I think it's just a recruiting thing. It's harder to turn adults who have more social connections, emotional intelligence, and more to lose than children into fascists. Disaffected, lonely kids will do anything to be part of some ingroup, and fascists promise kids that they can be the in a racial or religious ingroup.
Doesn't the original sin: taint after birth though, meaning there's an instance of innocence between being squeezed out and the sin particles adhering?
Not sure if in some Orthodox Churches it works that way but generally there isn't much distinction between a human in the womb and one that has been born, very few people believe in limbo nowadays, etc. etc. The perspective on when a soul/the human subject is formed has generally gone earlier for some centuries now AFAIK. I'm sure there's still some exceptional denominations that would say that original sin exists but only some time after birth though.
Makes me think about that guy who was "starting no fap and Christianity"
Antinomianism is a thing in Christianity too.