I have to agree, but with a slight exception. A properly raised and handled dog most generally will be a great dog, and a friendly dog. Yes, its the owner's responsibility and it takes work.

However a dog's breeding can, to some extent, determine how that dog "may" act/react as an adult dog. Anyone who has raised bird dogs to any extent will confirm that.
I raised and showed Gordon Setters for years, and regardless of perfect breeding practices, there are and will be differences in the different dog's reactions.

Pure bred basically means that there is "might be some way" to document the dog's pedigree. Others use the phrase to refer to a specific breed. Rarely do those who call a dog a "pure bred", actually have registered papers.

I have a niece and also a grand niece who both own pits. Both of the dogs are registered and are EXTREMELY friendly. Both of the dogs are friendly with other dogs, including cats. However both dogs were brought up using indoor kennels (crates), both dogs were brought up as puppies around other people (strangers), along with association with other pets.
I will say this though, should you grab either one of those ladies in a harmful way, you might just grab off more than you can chew. The dog won't.

Its easy to make a dog into a bad ask, it takes work and dedication to make a great dog.