i appreciate where you are getting sources from, but you are generalising the temperament of a breed of dog based of the quote of a guy who runs a rescue shelter for retrievers, of course they are going to be more aggressive than the usual GR, thats why they are being rescued
thats bs - they are NOT a known breed to attack
retrievers are well known to have one of the best temperaments, and are one of the best dogs for a family if it has been well trained
HOWEVER - like ALL dogs, if you dont train them at all, they can of course cause damage and hurt small children...