Here's where breeding for better birds comes back into play. Not to be overly repetitive, but when a hatchery indiscriminately breeds in large pens of cocks and hens, thousands per pen, for generation upon generation, no one, absolutely no one is particularly giving a tinker's darn about the temperament of the birds. Just mass produce them. Careless propagators (not serious breeders) do the same thing. The result is all these nasty roosters, plain and simple.
Over on the Heritage Rhode Island Red thread, a breed widely described as having nasty roosters, the breeders are, right now, discussing how tame, gentle and calm the heritage Nelson birds are. This goes against all the popularly held beliefs of people whose only experience with Reds is with the hatchery production versions.
If you get a good rooster? Use him. Chances are great his offspring will also be good birds. Get a nasty rooster? Why in heaven's name do people breed them? I honestly do not know. I keep preachin' it. People just need better birds. This is precisely why I include temperament in my breeding criteria, especially for my utility birds.