A logical deduction from a nice boy so far.
Angels are bad birds that ruin human habitats + Angels are weak -> Angels are vermin that ruin human crops with sheer numbers despite being so weak
Also,
Angels are so weak humans can kill them just by existing + There's a whole army of people in armor that resemble knights + Knights are amazing and strong -> The knights are here to defeat something scary and dangerous and definitely not the angels
-> Since I want to be a knight, I should try to help them out by dealing with these small fry so they don't get distracted on their way to the actual threat.
As a side, I'm surprised angels are being used to imply evil gods, since it was a goddess that helped the old couple sire a child in chapter 1. I mean, she was a bit stingy with the youth blessing, but...