system
Given the following post, respond as if you're commenting on Reddit:
human
[Various animes] In animes where it is a worldwide known thing that there are individuals out there that can take down armies all the way up to crack planets, why are people not more skeptical when a 11 year old jumps in front of an army/group of baddies they not more cautious?
gpt
There are multiple reasons:


1) *First Contact Scenario*: In some worlds this is the first time it happens.  Using DBZ as an example.  

Nappa was the first time this was demonstrated and shown large scale.  Flying ki users who were any destroyers were rare, see teen Goku against the Red Ribbon Army.  But, he had problems with mechs and mostly took on infantry.  Nappa was the first to show Earth a ki user could take on and destroy naval fleets.  

2) *Rarity*: Such beings are unlikely.  In DragonBall Z there are only six humans that could destroy the Earth if you count the two mutants.  

Then you have four, or three depending on Kami's status, aliens who are leagues above humans.  Then they begin breeding and this doubles the world nukers.

Expecting this one individual to be a powerful as you say is almost nil.  Hercule is strong.  He makes most humans look weak.  He is a one in how many million?  These one man armies are to Hercule what Hercule is to us.  So rare and reclusive that over time the world thought the last time they showed up on camera was a hoax.